We very much enjoyed staying at Günther and Elisabeth's place. I did not meet them, but Elisabeth was extremely responsive and helpful when we needed to check in a little bit early. The flat is ideally located for exploring the city – very central, close to Stephansplatz and within 10-15m walking distance of Mitte (where you are likely to arrive from the airport by public transport), but also in a very quiet street and block. I was travelling with my partner on this occasion, but would feel fairly safe to leave and enter the flat late at night. The main room (bedroom and sitting) is spacious, warm, and comfortable (as is the bed). The wifi worked well, and there was plenty of hot water for the shower. There a lift, but it doesn't go to the floor that we were on (unless we missed something!), but as the flat is only on the 2nd floor this was not a problem.