Great location, close to the Hauptbahnhof (main train station), Schloss Belvedere, supermarkets, etc and very good value for Vienna. Communication was also good - Zahra's friend was there to let me in and responded to WhatsApps
It is an 'occupied apartment' but there are advantages to this (cooking stuff, an iron, etc). So long as you're not wanting an empty apartment I would strongly recommend Zahra's place. I would stay again :)