Sebastian was a great host and was more than willing to work with our tentative arrival time. I stayed with three others and we really only used the flat to sleep (the beds were very comfortable) - we were out and about from about 8am - 11pm every day. Getting around Berlin was very easy as the flat is only about 2 blocks away from a station.

There's an Irish pub down the street (the Tappetary?) which has free wifi.