We've stayed there for a week, in the 2-bedroom apt (2 adults and 2 kids). it was very spacious and quiet.The kitchen had the basics, there was a 42" plasma TV and DVD and a small stereo. The location is great specially if you are with car (like we were), lot's of restaurants right around the corner, a supermarket really close (1 minute walk) open until 00:00.
The apartment was clean and well organized, it's an apartment building so there are also the locals, and the staff doesn't really speak English.
The place just lakes a free internet connection and parking space (both are available with extra charge).
All and all we had a great time and this apartment was part of it. Great value for money and we will defiantly come back if we are back in Berlin.