Elisabeth was a wonderful host. She kindly met us at after midnight (due to our delayed flights) to let us into the apartment. She even brought home made cake!
The apartment was just as described - large (for a European apartment), clean, well appointed and comfortable. This would suit two couples.
It is close to public transport (half way between Praterstern and Nestroyplatz stations. It is easy to walk almost anywhere from here. I've stayed in three places over the last three weeks in Vienna - I should have stayed here from the beginning!