On the 3rd floor of the Ars Electronica Center, this glass cube has stellar views over the Danube to the south bank and glows purple after dark. The menu is seasonally inspired, fresh and contemporary, along the lines of poached salmon with herb risotto and orange-fennel salad. The two-course weekday-only lunch is a snip at €8.50.

For dazzling nighttime views, head to its cocktail bar.