Rudolf was a terrific host. I did not stay in this apartment, but the building is on the nicest intersection in Margareten. Bus 59a goes straight to Opera and 13a to Mariahilfer and Hauptbahnhof… U4 just two blocks away. I stayed during pandemic restrictions, but normally there are plenty of food and drink places just steps away... fine bakeries too. Internet was fast and reliable, heating excellent. I stayed for a month.