The room was very nice and big. It was super clean with a nice smell. Also, the facility was great, and there was a shared kitchen as well.
The apartment has a really good location. It's close to different public transport. So you can basically get to anywhere easily.
My host was also very nice. She offered my a lot of tips for my visit, even though I'm only staying there for two days. She's always very accessible, and replies very fast.
In general, I strongly recommend this to everyone! It's one of the best experience I have, and the stay left me a very good impression about Vienna as well.