The Steigenberger Frankfurter Hof’s Mercedes glides around Willy Brandt Platz and I gaze up at the six-floor building’s Ehrenhof terrace and stone gargoyles. At Bethmannstrasse, the door is opened by an ambassador type in a full morning suit and top hat. I tread around a gold floor plaque marked 1876, the hotel’s birth year, and ascend eight red-carpet steps to the lobby. Room keys now have a floral pattern, replicated on the Bucherer-sponsored folder around them.