Petra is by far the best host I had. Her apartment is just perfect. It is completely equipped, one can see that Petra thought of everything. She was very welcoming and there to help us with anything.
The building is also beautiful and located in a very nice and quiet neighbourhood, which adds to the entire experience. There's a very cute cafe on the corner of the street, which I would recommend.
The train station is very close, but it is a nice walk to the center of the city as well, if one prefers that.
If I'm ever in Vienna again, I would definitely love to stay in Petra's apartment.