The apartment is amazing! Clean and well equipped. The are is very calm and quiet, and the best part is that a 5 minute walk away are two metro stations that can take you to the very heart of Vienna in 10-15 minutes! Stefan was very helpful and responded to messages promptly. The only drawback was that the apartment gets very hot in the summer, so it might be useful to check the weather forecast in advance - but that's only for the few hottest days of the year.