The apartment was nice and well located. It is near the Praterstern and Nestroyplatz so communications with the center and the airport are pretty good. You can also go by walking to the center in 30 min.
For people with reduced mobility be careful because the apartment has a lift but you need to go to the first floor to take it (which, for big luggage, can also be a disappointment).
Plamen was a perfect host. He answered all our questions very quickly and gave advices for visiting, having lunch, etc. Even more, we arrived to Vienna before the checking time and the apartment was ready for us.