The place is extremely well placed, more than you could ever expect. The ticket store for public transit is right in front of the building, the tram that goes straight to the city centre is right there too, and a bus that goes south to Schönbrunn palace is minutes away. All of that with the benefit of being located in a quiet and not as densely packed part of the city (there are great restaurants there too!)
The place is also very cool, combining modern elements with antique furniture.
Heinz as a host is very kind and responsive, always being there to answer any questions we had.
There're all the basic things in place, from shower gels to coffee filters, to not be bothered with having to go to the supermarket be the first thing you do after you leave the airport.
It was so good I'd rent it again whenever I'm back in Vienna without a moment of hesitation!