Whether your stay is short term or long term this apartment has a perfect location. The city centre is within walking distance, and if you don't want to walk trams take you there. I stayed for two months as a visiting scholar and the tram 1 took me directly to the university (walk three blocks, tram 15 minutes). Also, the train and U-bahn hub Mitte is close by, less than 10 minutes walk.
The flat is extremely quiet, I heard almost nothing of the neighbors and traffic is negligible. Church bells are just charming.
Flat is well equipped, clean and practical. Relatively spacious, and a nice high ceiling. Its windows are facing north so the sun never enters the flat (for good or worse). The couch in the living room is very easily turned into a comfortable extra bed.