Dagmar (Nadia's mom) was great-- she met me (late!) at the train station following my arrival from the airport, and made sure everything was set in the kitchen before I'd had a chance to go out to the grocery store. The apartment is in a great location, directly across the street from Messe Prater, so getting elsewhere in the city is super easy. The only drawback is that the double bed is a futon which did a number on my neck after a few nights. My boyfriend had no problems though, so YMMV.
Thanks, Dagmar!