This place is right in the heart of Vienna, 2 mins walk to the cathedral. 5-10 mins walk to any restaurant. Very good spot to visit Vienna.
Helpful tip: Go park at the Marriot hotel 10 mins away for 50euros a day, its not cheap but definitely hazle free (you pay 4 something per hr until you reach 50) and then the rest of the hrs are free until you start a new day. Easy to get in and out of the garage, go to the car etc.