This is a fabulous place, well described. It's on the ground floor in a quiet residential area just off Karl-Marx Allee. There are shops and restaurants within easy reach, and it's very easy to get into central Berlin and the airport via U-Bahn.
Sparkling clean with everything we needed. Check in was great even though we arrived quite late - thanks to Hans for spotting us looking for the right apartment number and passing on lots of useful info.
Thanks very much!