Overall it was okay.
The location is great, we really enjoyed the area. The backyard in which the flat is located on the ground floor makes it a little gloomy even though the sun is shining outside, but at the same time it's really quiet especially at night. We slept really well there. From the inside everything is just like on the pictures so really nothing is missing in the flat itself. Also the bed was really comfy and the bathroom was nice. Shower was mounted too low for people taller than 1,20.
In case you don't like it cold you may want to skip this flat entirely, no matter what season you travel as in Germany a rainy day can happen throughout the entire year. In that case the heating will be fixed to 18 degrees and for us that wasn't enough as the ground floor is really cold. In the house rules they write that you cannot change it, but we still asked twice whether they could kindly turn it warmer but the answer was no.
They have put little cards all over the flat where they call the place "Berlin Prestige Living", I found this ironic for a place that doesn't allow to increase the temperature and has a breakfast table with views to the community dump where constantly people pass by to drop their rubbish and watch you (a curtain could solve it). Also the shower wasn't mounted properly.
So overall okay but not really a stay we would want to repeat.