The flat was nice for a weekend in Berlin. The location is perfect (Breakfast just above the street, Great Burgers around, good Döner Kebab, Späti, supermarket, U-Bahn, S-Bahn).
The checkin is very professional in the kiosk next door. The flat is equipped with everything you need. The furniture is simple cheap Ikea style but ok. One of the mattresses had some red wine stains, overall cleanness was ok but not super clean. The room facing the street is a little bit noisy, but still ok (don't worry no party in front of the door), the room to the backyard is very quite.
overall impression: flat is ok, but not as nice as the pictures tell you. Some more flats in the house available via Airbnb by the same hosts. Rather expensive in my opinion.