We had a wonderful time staying at Alex's flat in Kreuzberg. Everything was exactly as expected -- it was a clean, modern apartment in a quiet residential neighborhood, but easily within walking distance of public transit and a number of great restaurants. A nice touch was that Alex and his wife have prepared maps of the neighborhood, marked with their recommended places to go, which helped us make the most of our short stay. Overall he and his wife were easy to get in touch with and very helpful and kind.