The apartment is great, the location fantastic, and Katharina is a wonderful host. She replies quickly, and is always ready to help and solve problems or answer questions. We were there in a very hot week in summer, but the apartment got cool at night, and the fan is really good when it gets a bit warm. The apartment faces the street, but it is not loud, there are some buses in the morning, but inside the window blocks well sound, even if it's tilted, and you can get some air. The blinds really work well and have a system that allows air and blocks light at the same time. The bed is absolutely wonderful to sleep, the apartment is very clean and very pleasant. Just be patient with the shower, that needs sometimes to be turned off and on again, but it works then really well. We talked to Katharina about that and I'm sure she will look into it. In short, the area around has everything you could need, it is super safe, and it is the best place to stay in Vienna, I guess! Katharina's restaurants indications are all wonderful, if you go to a place she indicated, it can't go wrong! Great experience, thank you Katharina!