I have been several times to Vienna with my family and definitely this is the best place to book. It is located very central. You just get out of the apartment and 50 meters away there is a Spar market. You cross the street and you reach the main shopping/pedestrian street, Kärntner Strasse that leads to St. Stephan's Cathedral.
The apartment has a modern design, equipped with everything you need (even more than basic needs). Everything was clean. The equipments in the kitchen were all brand names, good quality. It is an apartment where someone actually lives day by day and not just an usual "for-rent" only apartment that you find on almost all other hosts. This is definitely another advantage.
If you come by car, there are enough available parking spaces in the street, free after 22:00 till 9:00 and all day long on weekends. Also, there is a regular paid parking garage exactly near the building, if you have trouble finding free parking spaces in the street.
The only con is a light buzzing noise in the bedroom from some electric equipment in the building, but this was mentioned already in the host's description. No other noise sources, even if it is central.
There are too many pros for you to miss this place. Book now and you will thank me after. I will definitely be staying here on my next visit to Vienna.