Günther's appartement is really nice, much bigger that in the pictures, nicely decorated with all the things you may need.
The communication with Günther was really easy and fast, he is a great host.
The apparment though is not in downtown is really well located since there's a subway station 5 minutes away that connects with Stephansplatz so in 15 minutes in total you're in downtown. Besides that it has supermarkets close which is a plus.
I recommend very much Günther's place