Absolutely wonderful small place in a very quiet place in Berlin. Located outside the city center is no problem at all because local transport (S-Bahn, U-Bahn) is around the corner.
All things you need for a city trip to Berlin is available. A good bed, a small kitchen with supplies and a clean bathroom with a nice shower.
Serkan is a perfect host and responds to all the questions you might have very quickly. Most of the times within a few minutes.