Although we didn't meet Slavo due to his business trip, his digital communications were prompt, effective, and helpful. This apartment is excellent: two blocks from the Convention/Congress Center one way, and 2 blocks the other way to the Danube River (good for restaurants and walks), very comfortable and modern, everything works, plus a lightly stocked kitchen on arrival.
We very much enjoyed our week in Vienna significantly because of Slavo's welcome, responsiveness, and excellent apartment.