Thomas' place is right on the main shopping street, which is a fantastic location (and extremely central!) It is walkable to most of the big attractions / historical buildings but we also found it very easy to hop on the ubahn (Neubagasse is just a minute's walk away) and go a couple of stops to wherever we needed. The street can be loud in the daytime but that didn't bother us as we were always out. It is quiet in the early mornings and mostly in the evenings when the shops are closed (or when the windows are shut!)
Check-in and out with Thomas was extremely easy and he was very accommodating with our requests for early check-ins and late check-outs, which was kind of him. Tea and coffee and guidebooks in the apartment were a lovely touch, and Thomas was very quick to reply on AirBnB. We loved our time in Vienna and would stay here again.