What a fantastic apartment! Arya's place is a great find just a couple blocks off Stephansplatz. The pictures really do not do this place justice--it's simply beautiful!
While we didn't get to meet Arya in person, his instructions for checking in were clear and accurate, and he even called to double-check that we'd gotten in okay (a nice touch). The check-in process was easy, and there were no issues getting in or using the apartment. Our only trouble was choosing which bedroom we wanted--they were all great!
I'd highly recommend this apartment to travelers to Wien. We'll certainly be staying here again if we find ourselves back in the city.