The location is quite good, 50 meters from the U-Bahn station.
Unfortunately the place itself doesn't at all live up to the expectations you might get from the pictures provided. It seems these were taken at least 10 years ago when the apartment was still new. For the check-in the company requests you to provide an exact arrival time and to call an hour before you arrive. Despite we gave an accurate arrival time the apartment was not ready at all and the company just started the cleaning. We had to wait 2.5 hours before we could enter the apartment. The level of cleanness is rather low compared to many alternatives at comparable prices. The staircases are really nasty and I wouldn't dare sitting on the armchair or the couch as there where white stains. The door handles in the kitchen were sticky and in the fridge were red splashes from what I hope was only strawberry juice. The covers of power sockets have been broken and the door of one of the bathroom doesn't close.
As we asked for a partly refund for some of these problems the host replied with excuses, and blamed that the apartment was not ready because we arrived 10min earlier.
All in all, the apartment is average at best and totally overpriced for what it is. See similar reviews for apartments of BerlinLux also on other booking websites.