Ingrid's place is a gem! My friend and I really loved it! Vienna was very cold when we visited. We even wanted to just stay in the apartment as it was so cozy and comfortable and beautiful!
The little breakfast, juice, tour guides etc that Ingrid (or maybe it was Stefan) prepared for us are very sweet. We felt welcomed and warm in a city that we were visiting for the first time.
Ingrid was traveling so her son Stefan received us. He was very friendly and very responsive to our requests and questions. Although we didn't meet Ingrid in person, somehow the decorations and the atmosphere of the apartment gave us the feeling that we did meet her.
In a word, Ingrid and Stefan really made us feel a spirit of sharing, which is getting rarer as increasingly Airbnb are managed by professionals and become more like hotels. We appreciated this very much and would highly recommend their place to everyone who visits Vienna.