The Wi-Fi connection is really bad. And during our arrival the smartlock stopped functioning in the proper way. The neighbour helped us and we got into the flat in 30 minutes. The flat itself kinda wet, but it was not so hard to deal with that. We stayed there for a week, and I'd recommend you to stay there for less days. If you're going to berlin for a week or more, find something bigger. Sometimes the owner replied really late. But so far, so good. I really appreciate the neighbourhood.