diff --git a/fishbook/frontend/frontend_classes.py b/fishbook/frontend/frontend_classes.py
index 542e87b..3e3fc0b 100644
--- a/fishbook/frontend/frontend_classes.py
+++ b/fishbook/frontend/frontend_classes.py
@@ -7,6 +7,8 @@ from IPython import embed
 from fishbook.backend.util import progress
 
 class Cell:
+    """The Cell class represents a recorded cell. It is characterized by *id*, the cell *type*, the *firing_rate*, and the recording *location*.
+    """
     def __init__(self, cell_id=None, tuple=None):
         if tuple:
             self.__tuple = tuple
@@ -20,18 +22,40 @@ class Cell:
 
     @property
     def id(self):
+        """The id of the cell. Unsually the same as the dataset name.
+
+        Returns:
+            str: the id
+        """
         return self.__tuple["cell_id"] if "cell_id" in self.__tuple.keys() else ""
 
     @property
     def type(self):
+        """The cell type.
+
+        Returns:
+            str: the cell type
+        """
         return self.__tuple["cell_type"] if "cell_type" in self.__tuple.keys() else ""
 
     @property
     def firing_rate(self):
+        """The firing rate of the neuron, if applicable, else 0.0.
+
+        Returns:
+            float: the firing rate.
+        """
         return self.__tuple["firing_rate"] if "firing_rate" in self.__tuple.keys() else 0.0
 
     @property
     def location(self):
+        """The recording location which consists of the structure (e.g. brain), the region (e.g. ELL), the subregion (e.g. lateral segment), 
+        the depth below surface, the lateral position and the transversal section if applicable. The latter two are given according to the 
+        [Apteronotus brain atlas](http://nelson.beckman.illinois.edu/atlas.html).
+
+        Returns:
+            dict: the recording location
+        """
         keys = ["structure", "region", "subregion", "depth", "lateral_pos", "transversal_section"]
         loc = {}
         for k in keys:
@@ -43,23 +67,55 @@ class Cell:
 
     @property
     def subject(self):
+        """The subject in which this cell was recorded.
+
+        Returns:
+            fishbook.Subject: the subject 
+        """
         return Subject(tuple=(Subjects & {"subject_id": self.__tuple["subject_id"]}).fetch(limit=1, as_dict=True)[0])
 
     @property
     def datasets(self):
+        """All datasets that have been collected from this cell.
+
+        Returns:
+            list of fishbook.Dataset: the linked datasets
+        """
         return [Dataset(tuple=d) for d in (Datasets & (CellDatasetMap & {"cell_id": self.id})).fetch(as_dict=True)]
 
     @property
     def repro_runs(self):
+        """All relacs RePros that have been run while recording this cell.
+
+        Returns:
+            list of fishbook.RePro: the repros
+        """
         repros = (Repros & "cell_id = '%s'" % self.id)
         return [RePro(tuple=r) for r in repros]
 
     @staticmethod
     def unique_cell_types():
+        """List of unique cell types stored in the database.
+
+        Returns:
+            np.array of str: the cell types
+        """
         return np.unique(Cells.fetch("cell_type"))
 
     @staticmethod
-    def find(cell_type=None, species=None, quality="good"):
+    def find(cell_type=None, species=None, quality="good", test=False):
+        """Find cells that match with respect to cell type, subject species, and recording quality.
+
+        Args:
+            cell_type (str, optional): The desired cell type, case insensitive. Defaults to None.
+            species (str, optional): The species name, or parts of it. Defaults to None.
+            quality (str, optional): The desired qulality. Defaults to "good".
+            test (bool, optional): Whether or not this query is a test run. Defaults to False.
+
+        Returns:
+            list of fishbook.Cell: the matching cells, empty it test==True.
+            int : the number of matches
+        """
         cs = Cells * CellDatasetMap * Datasets * Subjects
         if cell_type:
             cs = cs & "cell_type like '{0:s}'".format(cell_type)
@@ -67,11 +123,19 @@ class Cell:
             cs = cs & "species like '%{0:s}%'".format(species)
         if quality:
             cs = cs & "quality like '{0:s}'".format(quality)
-        return [Cell(tuple=c) for c in cs]
+        results = []
+        total = len(cs)
+        if not test:
+            for i, c in enumerate(cs):
+                progress(i+1, total, "fetching %i matches" % total)
+                results.append(Cell(tuple=c))
+        return results, total
 
     def __str__(self):
         str = ""
-        str += "Cell: %s \t type: %s\n"%(self.id, self.type)
+        str += "Cell: %s \t type: %s\n" % (self.id, self.type)
+        str += "Baseline firing: %.3f\n" % self.firing_rate
+        str += "structure: %s \t region: %s\t subregion: %s\n" % (self.__tuple["structure"], self.__tuple["region"], self.__tuple["subregion"])
         return str
 
     @property
@@ -286,15 +350,15 @@ class Dataset:
         return self.__tuple.copy()
 
     def __str__(self):
-        str = "id: %s\n" % self.id
+        str = "dataset id: %s\n" % self.id
         str += "recorded: %s \t by: %s\n" % (self.recording_date, self.experimenter)
-        str += "duration: %ss \t quality: %s\n" % (self.recording_duration, self.quality)
+        str += "duration: %s min \t quality: %s\n" % (self.recording_duration, self.quality)
         str += "comment: %s" % self.comment
         return str
 
 
 class RePro:
-    """Repro class represents an entry in the repro table. This is a run of a certain relacs "Research Protocol".
+    """The RePro class represents an entry in the repro table. This is a run of a certain relacs "Research Protocol".
 
     """
     def __init__(self, repro_id=None, tuple=None):
@@ -406,6 +470,12 @@ class RePro:
     def _tuple(self):
         return self.__tuple.copy()
 
+    def __str__(self):
+        str = "RePro: %s\t id: %s\n" % (self.name, self.id) 
+        str += "run: %i\t on cell: %s\n" %(self.run, self.cell_id)
+        str += "start time: %s\t duration: %s\n" % (self.start, self.duration)
+        return str
+
 
 class Stimulus:
     """The stimulus class represents a Stimulus that was presented. A Stimulus has several properties 
@@ -510,6 +580,11 @@ class Stimulus:
         
 
 class Subject:
+    """Representation of the recorded subject's properties.
+    A subject is defined by the its *id*, and its *species*.
+
+    The 
+    """
     def __init__(self, subject_id=None, tuple=None):
         if tuple:
             self.__tuple = tuple
@@ -544,6 +619,15 @@ class Subject:
 
     @staticmethod
     def find(species=None, test=False):
+        """Find all subjects matching the given species. 
+
+        Args:
+            species ([type], optional): [description]. Defaults to None.
+            test (bool, optional): [description]. Defaults to False.
+
+        Returns:
+            [type]: [description]
+        """
         subjs = Subjects & True
         if species:
             subjs = (Subjects & "species like '%{0:s}%'".format(species))
@@ -559,9 +643,18 @@ class Subject:
 
     @staticmethod
     def unique_species():
+        """Unique list of species names.
+
+        Returns:
+            np.array: unique names
+        """
         all_species = (Subjects & True).fetch("species")
         return np.unique(all_species)
 
+    def __str__(self):
+        str = "Subject: %s\n" % self.id 
+        str += ""
+
 
 if __name__ == "__main__":
     from IPython import embed