I stayed at Erich's apartment for 4 nights and had a great stay. The check-in process was supersmooth, the apartment was spacious and clean, and best of all, the location is hard to beat. The Hofburg is only a few minutes' walk away along with other attractions in the Innere Stadt. It was very easy to walk around to Vienna's various attractions, and a U2 station was also close by. I had to use the cab a few times and it was also easy to get a cab from in front of the building. There is also a grocery store a few doors down that made it easy to stock on food and snacks. If I were to return to Vienna, this apartment would definitely be among my top choices.