Katarina was very friendly and also was ready to help us during our stay in Vienna. She also allowed us to stay in the flat a little longer as we had an evening flight.
The flat is located very comfortably, as you need only 10 minutes to reach the city center (using U-bahn). Moreover, there are two supermarkets near the flat.
Speaking about disadvantages of the flat, I would say that there are too many useless things on the shelves and in the cabinet drawers.
Mostly, we liked our stay in this apartment!