Petra was a great host. She was quick to respond to messages and was very helpful. The apartment was excellent. My wife and I stayed there with our ~8 month old baby for 3 nights. The apartment was very nice and seemed larger than it appeared in the pictures. The location is great with numerous tourist sites easily walkable. The Museum Quartier, Kunsthistorisches, Natural History are all about a ~10 minute walk away. The Hofburg Imperial Palace is about 5 minutes beyond the museums and its another 5 minutes or so to St. Stephens Cathedral or the historic city center (so ~20-30 min total depending on pace). Its also ~20 min to the Naschmarkt. And if you're not up for the stroll, there is a metro stop about a ~5 minute walk that gives easy access to all places listed. Easy metro access to Schoenbrunn Palace and the airport train as well (just a few stops away). The immediate neighborhood is also quite pleasant, a lot of good restaurants and shops that are not loaded with tourists. I would definitely stay here again if I return to Vienna. We wished we had more than 3 days -- there's so much we didn't get to do!