Ilona's place is large, with a very high ceiling, and bright in living and bedroom. Sofa and bed both comfortable. Double glazing, generally quiet, and clean. Kitchen and bathroom are dark (no windows to speak of), and bathroom would benefit from extraction fan.
Location very close to tram #5 (just around the corner), and #2 (~7 minutes walk), and Praterstern metro (<15 minutes walk, or 1 stop on #5). Supermarket across the street, very convenient.
The actual area of town is not the best, but the apartment itself was great. I liked the fully automatic coffee machine and the easy connection to sightseeing spots as well as the conference center. Key to a small room outside the main door of the apartment was also very convenient, allowing luggage storage for late departure following 12 noon checkout.
Very reasonably priced, and I would definitely return.