I had a wonderful one month stay at Ben's place. The room is bright and spacious and has everything you need for a solo stay. A slight warning for allergics/asthamics, the room gets dusty very quick. However, in general the apartment is kept fairly clean, the kitchen is well equipped (except for the microwave). Overall, the minimalist approach to the space helps your mind rest, and the designer furniture gives an aesthetic kick.
Ben is a friendly and helpful host. He checked directions for me several times and recommended places worth visiting in Berlin. He would also ask if everything was ok during my whole stay. His pup Momo is adorable, sometimes impossible to stop petting :p and I even got a chance to walk him a few times.
The residential area is nice and quiet. The supermarket is just across the road. Long but easy access to the city center by tram.
If I was to come back to Berlin, I would definitely stay at Ben's again :)