Nina's flat was in a great location and really nice and clean! We had no problems being met there with keys and nina checked up on us during the stay which was nice. The only problem was a slight smell of cigarette smoke which we informed nina about and then she apologized and told us it was the people before who stayed for a long time and smoked inside which was nt allowed. So not nina's fault at all and the smell faded. Would defintaly reccomend staying here, perfect for a long weekend in berlin with friends.