Time Out says
The Kronenhalle is a haunt of the rich and famous and has an extensive art collection, including works by Chagall, Miro and Braque. Make sure you dress up.
It might have been Gustav Zumsteg's extensive art collection that originally attracted the rich and the famous, but it's a self-generating phenomenon: more of their like keep on coming. Politicians, artists, writers and international superstars have all passed through the unpretentious doors of this establishment and wondered where they would be seated - below the Chagall, next to the Miro, left of the Braque? Wear your best clothes and bring your snottiest attitude if you don't want to make a bad impression.