Great place, highly recommended.
This is a real viennese apartment with 2 rooms on the first floor, there's a small but well-equipped kitchen with a refrigerator, and a nice coffee shop downstairs. It's located near the centre, just south of the Opera, on a relatively quiet street.
Nearest transport is with the U-bahn from Taubstummengasse and Karlsplatz, which is conveniently on the same line as the new central station.
It's a quiet and distinguished part of town, so I can't recommend this for noisy people who come home late at night, but it's perfect for a weekend of sightseeing.