We had a great stay in Wien and in Nicks place. Even though we didn't get to meet Nick in person, he had made all arrangements ready before our arrival and he was available through sms, e-mail and air bnb all the time. The flat was clean and nice, and located in a nice area. It's easy to get to the centre, either by use of public transport or just walking. We would recommend this flat without any doubt. :-)
Käthe and Jermaine