I have visited and worked in Vienna on and off for the last six years and stayed in many wonderful AirBnBs. This is the best by far. Location from the airport is fantastic (train to HBH then U1 south, get off at Keplerplatz all in 20 mins). The location to the city is incredible (7 mins to Stephansplatz).
The suburb is eclectic, vibrant and full of tremendous Turkish bakeries, a great local market on the weekend and all the usual supermarkets (Billa, Hofer, Spar 5 mins). Perfect for a couple needing a place to relax whilst they take in the sights of Vienna, or for a work trip.
I Can not rate this apartment highly enough. Katja was wonderful, helpful and accommodating.