I just returned from Berlin after a whole months stay in Gerhard's apartment. The apartment is nice and cozy, very clean and quiet. Everything worked well, no problems at all. Gerhard is really nice, always available per phone, text messages or whats app, has also given lots of good tips for Berlin. The flat is in a safe residential area, easy and fast to reach with buses or the city trains. Nice café's in the neighbourhood and nice restaurants a short walk away. Would stay in the apartment anytime again :)