First and foremost, Claudia is an outstanding communicator. We received very timely check in information and she was always quick to respond. For example, when we arrived we couldn't figure out how to turn up the heat. I messaged Claudia and within 10 minutes a very nice person was knocking on our door. She came in, got the heat going, and left, all in less than 5 minutes.
The apartment is exactly as described. We were 4 adults and we had plenty of space. Everyone had their own room. There was a very convenient grocery store right outside the courtyard and we were within 5 minutes of a bus stop. There was a cute Christmas market just a few blocks away, and everything was very walkable. It took us about 20 minutes by bus/train to get to the main Wien Hauptbahnhof. Restaurants and shops everywhere.
Overall, we would definitely stay here again. Claudia was a great host and this is a great apartment.