My husband and I spent 8 days in this lovely apartment. The location is fantastic, you couldn't get any closer to the underground station (U1, U3 Stephansplatz) and the city centre! Almost everything (museums, Opera, Musikverein and many other attractions) is within walking distance from the apartment. Caroline is a fantastic host, she made sure we felt comfortable and provided everything we needed. The communication was always fast and effective.
The apartment is cozy, the view from the window is very nice and the sofa bed is very comfy to sleep on. If you like, you can cook a meal, we found the kitchen comfortable enough for easy meals. The Billa supermarket is just 4 minutes away, so it's very easy to get some groceries from there. Despite the central location, if you close the window, it's very quiet.