We enjoyed our 3 nights in Apostolos' place very much.
The check-in was smooth, (we were a bit earlier) and Apostolos showed us around his apartment.
The apartment has all you need, a spacious bedroom with an annexed living room and a spacious, fully equipped kitchen.
The area is up-and-coming and closeby (if you take a right when you exit the front door) you have the Simon Dach Street with plenty of restaurants.
If you take a left, on the way to Subway line U-5 (There are 2 stations close by), you have a bakery with fresh bread and cake from 7 in the morning.
If you're in Berlin this is a perfect place to have your base.