I had a fantastic stay at Vince's apartment. The apartment is located right next to Görlitzer UBahn and it is very easy to bike from there to anywhere you want. I mostly went around Kruezburg, Mitte, Friedrichshain, and Neukölln and they are all within 10-20 minutes bike ride. (The apartment comes with bike parking). The house is located on the first floor and it stayed cool even during the hottest days with heat waves. Since it is facing the street it can be a little noisy particularly during the weekend but the room has a window shutter that blocks the noise.
There are a ton of great restaurants and bars open late and cheap. For me the best part was that it is so close to many parks and the canal (great place to hang out around the sunset), outdoor swimming pools, and Vipassana meditation hall. Vince will tell you everything he knows about the neighborhood. Over a month I stayed here, I got to know Vince over a coffee or beer and one of my best memories of Berlin is a night I went out with him and his friend and having my first shots of Berliner Luft. I could not ask for better way to spend a month in Berlin!