The communication with Tobias was easy and quick from the beginning.
He was away when I arrived but Alex, his very kind neighbor, was there to check me in and show me around. They were both available in case of need and Tobias had also left some useful written notes.
The flat was very large and nice, with everything as described and located just 3 min walk from a U4 line station, therefore convenient both for the city center and the Messe Wien Exhibition Congress Center.
A really great place to stay in Vienna!