Kemal's place was lovely, bright, spacious and clean, and a great location for exploring the rest of Berlin- we walked into town most days (about 45 mins) but the transport links were excellent if your legs don't feel up to it!
The apartment block did have a lift but it was up a short flight of stairs so I don't think it would be suitable for anyone with mobility issues.
The only thing we found was that there was quite a lot of traffic noise- which we did get used to- and we seemed to be on a hospital/fire station route as we heard A LOT of sirens rushing past whilst in the flat. Overall though a great experience!