Apartment 1 is a basic space but has everything you need to make your stay in Berlin great. It was spotless and Volker provides everything you need for the apartment included things you wouldn't expect (a beer each for the three of us was great after we arrived late due to a delayed flight).
Neukölln was an enjoyable part of Berlin to stay in with lots of cool bars, supermarkets, and plenty of amazing döner kebab places within walking distance.
I can't recommend this place enough! Dankeshöen, Volker!