Designer Christophe Pillet has taken a former Best Western in the sleepy sixteenth arrondissement and turned it into a style-monger's address. Walls in all 27 rooms are faced in gorgeous rough-cut, fossil-studded slate and have ebonized parquet floorsthe perfect backdrop for the chrome-plated bed. Unlike other high-design hotels, the Sezz is quite welcoming: Staff are anxious to be helpful, and you're offered a complimentary drink as soon as you arrive. There's a sauna and a steam room in the basement relaxation area, and the convivial bar/reception area is actually used by guests. The overpriced breakfast, though good, is annoying in a location where there's no nearby alternative.
When to go: Year-round, but especially September and October.
Which room to book: Nos. 69 and 75 for Eiffel Tower views, No. 32 for the large bathroom with a round tub for two (doubles, $426).