This fashionable establishment, in the basement of the 19th-century Vienna Stock Exchange, shares an enormous space with the flower shop Lederleitner and the air is mixed with the sweet perfume of tuberoses and the tantalizing whiff of truffle. Although this eatery is named after Theophil Hansen—the ornament-crazy architect of the Börse—the decor is sleek and modern; note the superb contemporary artwork adorning the walls. Chef Tom Frötsch and his team create a new menu of Mediterranean specialties each week. If you have a light appetite, ask for a smaller-size portion. Their brand new feature is a summer special: Brunch on Saturday 9–2.