Ralph is a perfect host, precise, polite, full of suggestions about Berlin if you need it, very easy to communicate with him. The flat is in a perfect area, close to metro station Merhingdamm, close to the center of the city (check point charlie, potsdamer platz, kreuzberg all), and very close to Bergmannn strasse, a place in which you can easily find whatever you want to eat, to drink, etcetera.