Duc Son is an amenable and flexible host. The apartment was absolutely spotless, the photos don't do it justice. It was warm, comfortable and there was plenty of hot water. It's in a great location, with two different tram lines right at the front door. We felt in the perfect location for exploring berlin. Although the street outside is busy, the apartment is surprisingly quiet with no street noise or noisey neighbours to be heard. I would highly recommend staying at Duc Son's apartment!!