Matthias and Gaby were excellent hosts (and have great taste in furniture) - highly communicative, responsive and very welcoming, and helpful in the time I stayed in their great apartment (which has the best kitchen). The apartment is situated in a very convenient location of Kreuzberg near the park, grocery stores, restaurants, markets, book stores, and just about anything you could need - as well as near the tram line. I highly recommend staying here and would definitely stay again, if I needed a place to stay in Berlin.