Wonderful apartment, I truly felt at home here.
I think I was lucky to book this place and not another.
There is no elevator and it's on the last floor (6), but honestly if you're in reasonable shape you'll be fine, and it's absolutely wonderful to spend time there.
Also the apartment was incredibly quiet and peaceful, and it's in a very nice neighborhood, with very easy access to scooters or the subway (which works great in Berlin)
Wolfram was always available and was very quick to respond and help me with a few small questions I had.