Sabine was very helpful and understanding during our trip in Vienna. The apartment is just as described and in a great place (the city center and the Schönbrunn palace are easy to reach by public transport).
P.S. I highly recommend to use the WienMobil app for purchasing a public transport ticket (weekly or a 3-day passes). Then you could easily get to the apartment from the airport by S7 train + 74A bus.