The apartment is in a perfect location - very quiet at night but right in the centre of the city (10 minutes walk to Stephansplatz & 5-10 minutes to the underground at Schwedenplatz) and very close to the airport bus drop-off.
The flat itself was clean and cosy (we loved the fleecy blankets) and had everything we needed. The stairs to the bedroom are quiet narrow though, so would be difficult if you have any mobility problems or dizziness (but was fine for us).
We were sent excellent & detailed instructions for how to get to the flat and how to use everything in it. And even though he had a busy weekend he took the time to greet us & show us around flat.
Definitely recommend and would stay again.