The flat itself is great - especially the huge bath and the kitchen. The location is awesome, just a couple minutes away from subway and close to a lot of grocery stores. Really quiet neighbourhood but you are able to reach city center within 20 minutes. Schloss Schönbrunn is also just a 10 minute subway ride from the flat. Kitchen is fully equipped and clean. As I said, overall really good place to stay!
The only negative thing is the "bed" - it's just two stacked mattresses and really soft, hence I decided to spend the last two nights on the sleeping couch in the second room of the flat. As you book the whole flat and the room was open, I thought its okey to do so as nothing else was stated - after my stay, out of nowhere, Nikolay requested extra money to clean the second room too as it was not allowed to use it. Airbnb advised to deny the payment and at the end I did not have to pay the extra, still it was annoying to deal with that issue.