The apartment is very nice, clean and fits to the given description.
The neighbourhood is very quiet. Their is a shop in a 2 min walk distance. The Subway station is basically at the building's door which is very convenient to go the other parts of this beautiful city.

Sarah was waiting at the building's door to welcome us and show us the apartment. She then showed us the main features (WIFI connection details for example).

It was a very nice stay and I would recommend Andreas' apartment for anybody who wants to visit Wien.

Thank you Sarah and Andreas!