A secret romantic nest only steps from Buckingham Palace, Hotel 41 is a hushed hideaway on the top floor of its moderately priced cousin, The Rubens. You take a tiny private lift and tread a snug network of creaking corridors to reach its heart, a two-level, galleried conservatory bedecked like something to make Henry Higgins purr: mahogany shelves, inviting seating, sculptural busts and an oversized globe, and a yawning skylight to let the light in. There, staff makes the rounds, quietly addressing guests by name and filling glasses with champagne and plates with an endless flow of scones and hors d’oeuvres. People forget to go outside and see London. The rooms are equally individualized and top-flight: done nearly entirely in black-and-white and lacking nothing. There’s no on-site restaurant or spa, and some rooms have no view to speak of—the focus is on intimacy, service, and discretion. The duplex Conservatory Suite, with a skylight over the bed, is popular with newlyweds and other nuzzlers.