I stayed in Stefan's place for just over 3 months and while taking German lesson and it couldn't have been much better. I found the building to be very quiet and it was great having the U-Bahn station and the S-Bahn a just around the corner.
The are many bars and restaurants in the neighbor and Mauerpark is also walkable with is great for a sunny Sunday afternoon.
Stefan was very friendly, helpful and an all round great host.