We did not stay in this specific flat, as the host alerted us of a double-booking issue. Yet instead of leaving us without accomodation, she provided us with backup accomodation in a different flat in the same building (flat T24), which is conveniently located near the main train station and Ringstrasse. Although we found this modification inconvenient, she was sympathetic to our concerns and we were able to come to fair compromise. Though her responses were not instantaneous, Stephanie always responded within the day to our communications and was friendly and helpful when she did. We never met her but she had a very effective system for checking in and out that made it unnecessary. One small thing I didn't like too much about the flat T24: because it was hot during our stay, we had to leave the windows open for fresh air and the street noise was cacophonous. On the other hand, the flat and linens were clean and equipped with basics for cooking.