Kati is a very good hostess as she made me feel at home immediately. Also the communication was good, so there were no problems during my arrival or departure. The apartment is a bit outside Vienna, but the city is easy to reach with the metro. The nice thing about this area, was that all types of shops are close by and that it was really quiet during the evening, so you can sleep very well.
Next time I go to Vienna I will definitely book again at this place.