Rita's apartment is a perfect place to stay if you have business in the UNO City, Donauzentrum, Kagran area of Vienna. My wife and I stayed there for 5 days in August 2021.
The apartment is perfect for a couple, with a sofa-bed option for a third person. Everything was extremely clean and well organized, and communications were good. Rita's son met us at the apartment with the key and explained how everything works. The kitchen is better equipped than average for rental apartments.
If you have a car, you can park for free on the street (although sometimes parking places are scarce). It's an easy walk to Donauzentrum for shopping or eating. We highly recommend Rita's place and will come back ourselves.