This is a small, lovely little apartment in the great neighborhood of Prenzlauerberg. We were a family of four -- two adults and two small kids.
-Less than a 10 minute walk to multiple S/U-bahn stations and many, many great cafes, bakeries, coffee shops, grocery stores, restaurants, playgrounds, etc. Prenzlauerberg felt a little bit like Brooklyn, and it was fun to be within walking distance of a lot of great stuff.
-Apartment has 1 small bedroom with a queen-size bed, a very small and serviceable (if somewhat outdated) kitchen, a large and new bathroom (with both tub and separate stall shower), a spacious living room (with a sofa that converts into a bed), and a fairly large/wide entryway (big enough for us to have our stroller, the baby's bed, suitcase, etc.).
-When we're traveling, a strong wifi connection is very important to us -- and this place had that 100%. Much appreciated.
-First floor apartment, but never felt unsafe; can lower the external (metal) blinds for privacy on the street side.
-Worked just fine for two small kids (toddler and early crawler) -- had to rearrange the furniture a bit to keep kids from breaking things like a decorative vase, but we were supplied with a travel bed (aka what the Americans call a "pack and play") in great condition, and the toddler did very well on the pull-out sofa.
One heads up around ownership:
-While this is a lovely apartment, it is not like living in a local's home -- this is the kind of place that is owned by a management company and is rented out continuously.
-Their customer service was excellent -- the nozzle on the bathtub broke during our visit, and while we would've been fine managing around it, it was fixed within hours of reporting it. However, I missed the personal touch of other places I've stayed where it's truly someone's home -- no personalized recommendations on favorite cafe or restaurant, no funky art/books/pictures, etc.
-This isn't so much the sharing economy (e.g., directing money to a local homeowner) so much as an alternate hotel economy (I think this company has something like 37 properties in Berlin -- not convinced there is even someone by the name of Ben Babazedeh still involved).