Ray and Armine were very kind and very accommodating (my flight was delayed, and I missed a connection--they adjusted their schedules so they could meet me at the apartment when I arrived). Communication via text was very good: the response time to queries was almost instantaneous. The flat is perfectly located in the Alsergrund: a one-minute walk to the tram, backing on to the University (which is where I needed to be), a few minutes from Schottentor (a major transit hub), lots of restaurants and cafes nearby, very close to the Votivkirche and the Ring. The flat is small, but good for a single traveler, or a couple stopping over in Vienna. Thanks Ray and Armine!