We really liked Thomas's apartment in Berlin. My wife and two kids (12 and 9) stayed there for three nights and had a great time. The place was not large, but still had enough space for four of us with the kids sleeping on a very large pullout couch that turns into a double bed. The apartment is in a neighborhood with a lot of shops and ethnic restaurants and it's right on the TXL bus line which goes to Tegel airport in one direction and most of the key places in the city in the other direction. Very convenient. The U-subway is only a few blocks away as well. The apartment is very clean and well-equipped including super-fast WiFi, which is always helpful. Thomas met us at the apartment and gave us an introduction to the city and provided us with maps and other important information. We highly recommend.