We really enjoyed our time in Elena’s apartment that we mainly used to sleep and get some rest between outside activities.
Location is great, almost everything is at walking distance: Vienna attractions, shops, restaurants, cafes, clubs. Stephanplatz and Metro station is 3 minutes way. From there you can go to Hauptbahnhof central train station with U1 in a few minutes. Very good access from airport by taxi (as we did) but someone may get bus from airport (Vienna airport Lines - 20 minutes drive / 8.00 euro) that stops at Morzinplatz station which is a three minute walk from flat.
Access to flat very easy.
Flat has two good size bedrooms with one double bed and a sofa bed in each bedroom.
Apartment was very clean and Elena responded in all enquiries and questions we had even for matters not relevant to the apartment.
Kitchen a bit small but has everything necessary although we didn’t use it.
Last tip, heating is very strong so you may want to lower as it may become uncomfortable at some stage in the night.