Heval's apartment is in Tempelhof, 2-3 min. away from U6 and S-Bahn linien. It's not the heart of the city, but it's very easy to go to popular districts like Mitte, Kreuzberg and Alexanderplatz. Communication with Heval and his college was very accurate and the place was exactly as promised. You'll enjoy your stay if you're a large group.