Le Roch Hotel & Spa boasts one of the best addresses in Paris—rubbing shoulders with the Place Vendôme, the Opéra Garnier, and the Louvre. Conceived by the hit French interior designer Sarah Lavoine, the 37-room hideaway features a sunlit courtyard—an ambrosial slice of greenery in the urbane landscape—a library, a destination restaurant, and an exclusive spa. Et voilà—a new first lady emerges among the grandes dames of Paris.