Beautiful space, great location, lots of plants and books. Supermarket right next door, walking distance from central Vienna, use of washing machine. I met Sonja and her boyfriend who were both lovely and kind, going out of their way to make my stay better. I even had the place to myself for two nights.
Only criticism: I was literally woken up (and kept up) by sudden loud noises while I was right next door. Felt that was pretty inconsiderate, but they were genuinely lovely in every other way.