Arzu and Tom were very accomodating and easy to communicate with. Fast check-in and check-out. The washing machine wasn't working when we were there but they were happy to help us wash a load of clothing.
Their apartment was spotless and larger than expected, with the living room alone larger than most hotel rooms in Europe.
We didn't cook but kitchen was well supplied and clean.
Bathroom was perhaps a bit small but definitely not an issue.
Location was close to metro station that was well connected (<5min walk), however, a bit far from Central Berlin. Furthermore, you'll need to change metro lines to get to Central.
However, there was a bus which went to Berlin hbf which was very convenient. The apartment is close by to a couple of small shops and restaurants. The area feels less affluent, but quiet and safe.
Overall, would highly recommend this place, especially considering value for money!