Diana's place is spacious and clean. It's a really nice apartment.
The location is great for a visitor in Vienna. It is near to the subway which allows easy access to both the airport and the train station. It is right off the museum district on the opposite side of all the shopping which means it is quiet, yet central. The streets around the apartment are quite beautiful and there are plenty of low-key restaurants and bars nearby. Like the rest of Vienna, it is very safe if you are worried about such a thing.
Communication from Diana was quick and pointed. She gave me exact directions to the apartment from the train station. She was there to greet me when I arrived and explained much about the apartment and Vienna. She gave tips on restaurants which I used to find a great meal. There was an issue with the WiFi when I was there, which Diana could not get fixed quickly since it required a visit from the provider. Despite the fact that I was not there for business so it was only a minor inconvenience, Diana refunded part of my stay as an apology.
I would recommend Diana's apartment as a base for touring Vienna.