"The 1870 Belle Époque landmark has "a wonderful ambience." Close to the Vienna State Opera and the Imperial Palace, this former headquarters of the International Atomic Energy Agency is in "the best location in Vienna." Rooms are decorated in Viennese style, with antiques and opulent fabrics; some have private terraces overlooking the city. The 2,400-square-foot Presidential Suite has a full kitchen, a dining room that seats up to eight people, and a marble bathroom with a whirlpool. Le Ciel serves French cuisine, while the Grand Café offers Viennese specialties and traditional pastries. Unkai serves Japanese. Expect "fantastic service from top to bottom."