The place is great!
We had a perfect trip. We highly recommend Katarina's apartment for cozy days in Vienna.
We liked very much the self check in and check out system because in this way, neither the owner, nor us had to wait for each other.
The place is very clean and comfortable, very suitable for 4 guests and had all the facilities needed.
The location is very close to public transport and we spent about 30 minutes to get at the Christmas Market from Rathausplatz.
Katarina was very nice and although she had problems with the parking place she promised to us, she resolved quickly and we could park safe and for free.
We plan to come back to Katarina's place next year.