Gili was an excellent host, very flexible and open. Also very organised (helped us plan our journey from the airport to the apartment) and had an assortment of maps at the ready in the flat.
The apartment itself is roomy enough for 2 or 3 people to stay in the main room and is very comfortable. It is situated in an interesting area of Kreuzberg near the canal and really close to the subway, so get ting to all the attractions in Berlin is easy!
I would recommend Gili's place without hesitation.
:)