Appartment was amazing - larger than we expected, clean and cosy. Great location - few steps from railway station what was important for us as we arrived and left from/to airport late at night. 30-40 min walking distance to the main attractions, if you do not like walking, subway is very close. Appartment is located near main shopping street, you can find many nice breakfast and dinner spots as well as bars just around the corner.
Easy self check-in.
Highly recommended, I will definitely stay here next time when in Vienna!