This apartment was perfect for our needs while visiting Vienna. It is in a great location to walk to nearby sights as well as convenient to the metro station.
Markus gave very clear instructions on how to access the apartment as well as a helpful list of places to eat and things to see and do all in a well organized Google doc.
Be prepared to get a good leg workout in as there are a lot of stairs! However it is very much worth it as the apartment is very clean and comfortable.