Although Marko the person who checked us in, was friendly and helpful, the owner of this apartment was remarkably hostile in his email communications. Our train from Salzburg was delayed by an hour. We emailed Jeroen (the owner) updated arrival times twice while enroute and apologized to Marko for the unexpected delay. The following morning, Jeroen wrote "In my 25 years in austria I never heard of a train being an hour late. I asked you to be on time and regret you ignored it". In subsequent correspondences, Jeroen maintained a hostile attitude of blame, which detracted from the experience of renting his apartment.
The location is indeed conveniently central, and the apartment is clean and lovely. The back bedroom facing the courtyard was quiet. However, despite keeping the windows closed in the front bedroom, our sleep was interrupted by occasional groups of loud tourists.