Perfect location, right next to Mariahilfer Strasse; the room is cozy and the apartment beautiful. Karla was responsive and allowed for easy check in and check out, though I've never seen her in person. however, when I had to shorten my stay due to family issues and informed Karla through Airbnb 3 days in advance before check in about shortening my stay (and possible partial refund for the half of the days I supposed not to be there), never received an answer.
also, I was not sure if she was any time at the apartment during my stay, which - could be a plus, because i had the entire place for myself - but at night I felt a bit unsafe not being sure if somebody will get back home/or not at night. I like to know who is at home with me and if i should be worried that somebody gets into the apartment in the middle of the night.
I definitely recommend to people who look for a good location, cozy room, and beautiful interiors!