Overall my experience was positive. The flat is really big and well-equipped, the kitchen looks brand new and the bathroom is clean and confortable. The location is ideal, very close to several active areas of Berlin and even closer to public transportation.
My stay went fine, even though there were a few hiccups along the way such as the washing machine breaking down or some repairs being scheduled while I was in the flat.
Overall I would recommend this flat, especially for the location.