We are a family of 4 and had a wonderful time at Benjamin's place in Berlin. It's very clean and has nice facilities.
The apartment is literally 3 minutes away from Tempelhofer Park - the old Berlin airport used during the postwar airlift in the 40´s. It is now an absolutely fantastic and huge recreational area. We saw people running, riding bikes, skateboarding, kite surfing, kite flying, roller-skating, picnicking and generally just enjoying themselves against this great backdrop - go there and be amazed.
There are plenty of nice and cheap places to eat and shop in the area especially near the local city hall (Rathaus Neukölln).
It's a 5 minute walk to the nearest subway station and transport around the city is easy and affordable.
The neighbours are mostly young and everybody is very polite and open - like the rest of the people from Berlin.
Do yourself a favour and go see Berlin - it is an amazing city, and Benjamin's apartment is an excellent base for you explorations!