The apartment's location is excellent, it is in walking distance from all the city's main attractions (Innere Stadt, museums, Naschmarkt, Belvedere etc). Moreover, there are quite a few good options nearby for lunch/dinner & supermarket.
The apartment is very nice, clean and cozy, and has all the basics that are needed for a comfort stay. The bed is a sleeper couch but it is more that ok. The shower & the kitchen are really nice. Finally, it is very easy to get to the apartment from the airport using the S/U-Bahn.
We definitely recommend it!