The apartment is really nice and was very clean. The room I stayed in was very spacious and had everything I need. The bed was comfy and big. There a quite a lot of shops and restaurants nearby and the U-Bahn station is also just 2-3 minutes away by foot. I only met Joanna on my last day in Berlin shortly before I had to leave. But she seemed very nice and the communication over the phone also worked well. There was a little issue with my arrival and the check-in, but it could be resolved and she tried to make it the most convenient for me. No complaints from me!