Compact, calm, and well connected
Easy to navigate, tidy, and the fast train into Vienna is a genuine pleasure to use.
It's on the smaller side, so choice at the gates can be limited late in the evening.
Vienna's airport is refreshingly manageable after some of the sprawling giants I deal with. I got from the gate to the city center on the express train in almost no time, which suited my schedule perfectly. Everything was clean and orderly, though the evening dining options thinned out toward the end.