The apartment is very well appointed, providing us (2 couples) with very comfortable bedrooms and an extremely spacious living and dining room area. Both bathrooms and the kitchen were well equipped. We were a bit worried about having to share one toilet, but eventually that didn't prove to be a problem at all. The apartment is in a very quiet location, away from any traffic noise, so we really enjoyed a good sleep every night.
The Naschmarkt with all its culinary attractions and eating/drinking places is just around the corner, as are several supermarkets.
A 15-20 minute walk takes you right into the centre of Vienna (Hofburg, Museums, Opera, Dom) and there is a underground station just around the corner, if you want to go further afield. All in all, a superb place which we recommend and where would certainly stay again!