Gerhard's flat is a gem : the apartment is sunny, very quiet at night, nicely furnished and designed and I found it perfectly clean.
The location is excellent : the district of Neubau where the flat is located is interesting in itself as a hip neighborhood and it is close to the city center and Museumsquartier.
During my stay, Gerhard, the owner, whom I had met before, was abroad so Gerhard's cousin Daniel and his friend Robert welcomed me very warmly and gave me some good restaurant tips. All the three were extremely friendly and genuinely hospitable.