We are a party of five, 3 adults and 2 children (6 y) who have spent 11 days in Berlin at Alexandra's house.
It was a very pleasat stay. The modern house is really nice and confortable. Prenzlauerberg is the best neighborhood to stay as it is calm and trendy at the same time - places, stores, cafes and restaurants are close and the subway is a 8 min. Walk.
Alexandra is very sympathetic and helpful. So we definitely liked the place.
Have a good trip.