Petra’s place is exactly as described and a great place to stay.
Everything was clean and tidy when we arrived.
We didn't get to meet her but we were greeted by Gabriella who was very friendly and informative.
The apartment had great heating, with a large and very comfortable bed. Kitchen is a bit small but you can cook yourself with no fuzz (Grocery store is around the corner too!).
The bathroom was a bit small too but you could accommodate to it in a heartbeat; we realized that was the case with most bathrooms in Vienna.
The area is quiet, located very close to the city center (10 minutes by metro line U4) and good connected with public transports (metro, tram, bus, 3 minutes away).
Also, Petra was very flexible with check-in and check-out time since her father has a shop just down the building, so you can return the apartment keys to him. In addition, if you’re leaving in the afternoon, he can keep your luggage safe until then, which is a big advantage.
Highly recommended!!