Not the best choice I'm afraid, especially if you're with more than three. The space is very limited, the kitchen is run-down. At least one of the four table chairs is unusable, since it's dangerous to sit on. The bedding is cheap/low quality and therefor not very comfortable. The appartment is only used for Airbnb and similar activities it seems, no one lives there permanently.
What we did like:
-location: great neighborhood for exploring Berlin by bike or metro (about 300 meters from Nollendorfstr station) despite being a little noisy because of the pub across the street
-shower with plenty of hot water pressure
-host met us when we arrived (no wait time) and reacted quickly to issue with window