All in all, we are very happy with our choice of apartment. The apartment is very well equipped, of good size and is very quiet. It is a little removed from the center of the district so you will need a map or a cell phone to find your way around the first few days but afterwards everything will be fine.
We discovered small places around to make our stay pleasant (a cheese shop and a nice butcher shop at Schönhauser Allee Arcaden). If you like cocktails, I recommend the small bar Lamm on the corner. We had a very nice stay in this apartment.