We never had the pleasure of meeting Igor in person since he was ill the day we arrived, however the instructions he sent us on how to collect the key to get into the apartment were crystal clear (even supplemented with photos) and left absolutely no room for doubt.
We had a good weekend in the apartment which was cozy, comfortable and perfectly cleaned and located in a calm building, the windows are modern meaning not much noise get in from the outside and besides its located in a calm corner facing a park anyway.
The location of the apartment is great too, not far from Praterstern from which there are several subway lines and local trains, so a great starting point for visiting Vienna.
I can highly recommend this to anyone visiting Vienna!