I feel incredibly lucky to have been able to stay at Diana's. The actual space looks exactly like it does in the photo -- brightly lit, spacious, clean and comfortable.
Check-in was flawless: communication was great, and Diana was there to greet me and let me in.
Location is pretty good. About a 6-8 minute walk from the Opera House, and 5 minutes' walk from/to Taubstummergasse Station (which serves only one line, but to Karlsplatz and Stephanplatz Stations in the city center for connections).
Finally, Diana is probably one of the best hosts I've had (over 7-8 AirBnB stays, usually with a companion). She was friendly, a great person, and made sure that I was comfortable.
Highly recommended.