The apartment is how is described by Apostolos. The entrance is by a quiet inner courtyard and the apartment becomes the perfect to spend a relaxing holiday. Inside it is spacious, well furnished and very clean. it's also well located, indeed it's possible to reach the UBahn in 10 minutes walking.
Apostolos is a really helpful host: he become us when we arrived and described everything inside the apartment and he also gave us informations about the Friedrichshain District. At least, the host was really kind to keep our luggages for hours before the flight, so we could spend a few more hours around Berlin.
I really recommend this apartment!