We stayed in Sylvia's flat for about one week, it was exactly as described, clean and with all the necessary things to live confortably, including the sofa bed. The location is nice, there are many bars, restaurants and shops and the building is rather close U-Bahn station. The communication with Sylvia was great: we asked many thing before arriving and we got immediate answer.
Unfortunately we could not meet her, but with the instructions received we could move without any problem. She gave us the phone number of her friend to contact in case of problem, but we didn't it.
We definitely recommend this flat to our friends and we hope to come back once again.