Staying at Harry's place was wonderful. Getting there from the airport couldn't be easier and then, I was right where one should be to discover the city. Close to the center and to all of the main museum. Bus is also a great option if you don't want to walk. The apartment is bring and huge. Everything one needs to have a great stay :-)
Harry has been wonderful as well. Always answering within a couple of hours to any question one may have.
To sum up, perfect host and perfect location if you want to spend a few days in Vienna and be close to the city center.