We really enjoyed staing at this flat. The location is excellent because it is literally right opposite a huge mall with a big food hall and a cinema if you have time for that.
It's also right next to a train station so getting into the center of Vienna is very easy and takes only about 15-20 minutes. You can also walk to the Danube in less than 5 minutes.
The flat itself is very clean and the bed is huge (King or Super King, not sure). It's great value and I'd stay there again.