I stayed here for 1 week, and I found the apartment to be perfect. It was very clean and had literally everything you need. Even small things that you dont think about, for instance I loved having an electric output right next to the bed, so I could charge my phone & laptop while while using them before going to sleep. The lightning possibilities of the apartment was also really nice, you could dim the lights or only have a little light on if you wanted to etc.
And I loved the bathroom solution! You can tell Sigrid put a lot of thought into making it a comfortable place to stay. She was a perfect host too, she always responded to my messages and gave me lots of tips about places I should visit.
The apartment is really conveniently located, right next to an U-bahn stop and with a grocery store and restaurants that also delivers right by. It's only a nice 10 min walk to innere stadt, so you don't really need to use the metro either. There is a nice park in the area that I spent a lot of time in as well.
The neighborhood is really quiet and safe.
All in all it was a really comfortable stay and I really recommend staying here 100%! I will definitely prioritize staying here next time Im coming to Vienna for a longer duration.