Sonia's apartment was great. I stayed there last week with my sister during our trip in Vienna. The apartment was spacious, clean and very well equipped. The apartment was just outside the city center but it was only 5 minutes away from the metro station (U3) which we used to explore the city. Sonia as a host also was great. She was replying immediately to my messages and she was flexible with the check-in times. Overall was a great experience!