The residential (and now fashionable) district of Châtelain is filling up fast with small boutiques and restaurants. Just off Avenue Louise, the area clustering around the central place du Châtelain maintains its vital neighborhood feel, but Odette en Ville has raised the bar when it comes to chic addresses. This small boutique hotel comes in stylish black, white, and grey. Located up a black wrought-iron staircase, the eight rooms follow the hotel's monochrome scheme, with dashes of lilac providing a subtle splash of color. Sultry and sexy, they are beautifully appointed with linen headboards, the best Egyptian cotton sheets, and moody photographs that may make you feel  as if you've strayed onto the set of an old movie. Bathrooms are equally luxurious, with white Italian marble basins and baths and smart chrome fittings. Even the bathrobes, with black piping, are a step above the usual.   On one side of the entrance there's a library-like lounge area, with wallpaper printed with floor-to-ceiling shelves full of books. On the other side, there's a second, larger lounge with an open fire for cold days and walls covered in black-and-white photographs depicting long-dead jazz legends, grand old railway stations, and former society beauties. The restaurant, just off the bar, has a growing reputation for modern French cooking. There's also a pretty terrace for outdoor dining.