We had a really nice stay in Vienna. The flat was nice, the communication easy and flexible, we had all we needed and enjoyed our time.
It's possible to stay at the flat with in our case 8 persons although there is just one shower and toilet (in two different rooms). WiFi was just near the staircase available but for us that wasn't a problem. There are three rooms where you can sleep but just one has a door so if you need more privacy that could be a problem. In our case it was fine.
Thanks for hosting us!