I had a great stay in Natalie's apartment. It is bright, clean and spacious with excellent wi-fi and very comfortable bed. The neighborhood is perhaps not family friendly but the apartment is very close to both a metro and railway station, so all the main attractions are easily accessible. It is also only a short walk to the Messe Wien conference center, which was a big plus for me. Natalie is a great host. It was easy to communicate with her and she replied to messages very quickly.