Inside, the mood channels a regal gentlemen’s club with ornate apartment touches, from terrazzo and bas-reliefs to ceilings that echo Marc Chagall. Days unfold between a mezzanine library for quiet tea-and-pastry breaks and a bright wellness center with a traditional Turkish hammam and bubbly spa tub area. It all sits on the Grands Boulevards, directly between Opéra Garnier and Place Vendôme.