I spent three nights at Joy’s apartment, and I really recommend it because of its position in the heart of Vienna.
If you stay there, you can easily on foot the most important attractions.
The apartment looks exactly the same as the pictures.
The communication with Joy (and the co-host) is the only aspect that could be improved. Indeed, even if the communication flows have been really fast, sometimes it seems that the answers have already been prepared and that made the communication a little bit impersonal.
However, I highly recommend this flat.