The place is ideally located from the city centre, only a few underground stops away.
Easy if you want to have a siesta during the day. In summer there is a beautiful open air swimming pool close by (Sommerbad Kreuzberg - about 20 minutes walk).
Chris and his wife have a friendly little boy and there are two nice cats.
I had my breakfast at a nearby bakery shop where you can sit and read.
I stayed for 10 days.