We stayed in Sandra's apartment for 2.5 weeks. It is located in an excellent area of Vienna, with abundant local cafés and restaurants, grocery stores and public transport. It is about a 20 minute walk from the central city ring.
The apartment was spotlessly clean and presented exactly as in the photos, with all the necessary kitchen utensils and amenities.
We did find that it was not a quiet place to stay: while it is at the back of the building, away from the street, we encountered a lot of noise from the neighbouring apartments directly above and beside, which also appeared to be being rented out to travellers. I did raise this with Sandra for one particularly rowdy group and she responded quickly and effectively.
Overall we enjoyed our stay.