My family and I (4 adults) traveled to Vienna for Easter. Kasia's apartment is just lovely. It looks exactly like in the pictures, only better. The apartment was very clean with all that we needed for our stay. The balcony and terrace are great for relaxing after a long day of walking around. It is very well located with good access to a subway station, and several bus stops. There are plenty of nice places to eat around, and a few supermarkets. Check-in and communication with Kasia went smoothly.
We would definitely love to stay here again when we go back to Vienna.