The apartment is large, new and nice. I love this kind of accommodation with a small kitchen to store something in the fridge or make a coffee (or even to cook!) but this apt in particular is really big. Also the bathroom was recently renewed, with a large bathtube/shower and a big sink and mirror, with lots of space for toiletries. Great plus: we found the apt very clean when we arrived, welcomed by one of the hosts who was waiting for us.
Last but not least, the position is simply perfect to visit Vienna even on foot. Less than 10 minutes from the Museum quartier and Maria-Theresien-Platz, 15 from Hofburg Palace and the middle of Innere Stadt. We took trams or metro only to and from the airport, to Prater and to Schonbrunn. If you want, though, tram line 2 stops across the street and Volkstheater stop of the Ubahn is less than 10 minutes away.
I strongly recommend this apartment, also considering the price which is very good for what it offers and in comparison with Vienna's prices.