Aida's place was exactly as described. It's a nice small but fully equipped flat with windows located to the inner garden, so it's quiet.
It has a great location, only 2 min away from U-Bahn (U3) and 4 stops to central Stephensplatz. Also there is Billa (groceries store) and some restaurants nearby.
The communication with Aida, or rather her aunt in our case, was smooth and very responsive. She also had no problem with a late check-out which was a big plus for us.
Overall we can only recommend this place if you want to explore Vienna or if you have some business to attend since it's great location and equipment.