I booked late for visiting a conference and everything worked great. Nathan and Nicolas are very welcoming hosts. The location is very close to traffic communication and the historic center. The prize for the location is a decent amount of noise from the streets as the cars cross the trams. But at the time of the traffic peak you should be outside anyway discovering Vienna. I loved the area around Judenplatz just on the other side of the channel with nice bars and old town atmosphere.