The rooftop apartment is trully beautiful. There is a large terrace, large roof window, plenty of light. The beds are really comfortable. The whole flat is nicely decorated, well equipped, loads of storage room.
There is a shop Spar Gourmet just around the corner.
Location is also fine - walking distance to Karlsplatz as well as Hauptbahnhof or Belveder. Or you can reach the city centre by tram No.1 in app 10 mins.
The host provides a very detailed handbook with basicaly all information you may need. Overall a great stay.