Nikolai's flat has a very cool atmosphere, is furnished as described with vintage furniture and is equipped in everything that you might need. Neither Nikolai nor Anni (who has welcomed me as I checked in and was super nice!) were in the flat during my stay and I had a lot of privacy. I didn't spend much time there, but as a starting point for my daily trips it was perfect. It is very close to metro station and is 15min away by foot from Mariahilfer Straße. There are no shops on the street where the flat is, but you just have to cross the small Wien canal and there are plenty of them! The area was very calm and safe and must be beautiful in summer (I was there in January). All in all I recommend Nikolai's flat!