Leave Renaissance and baroque Italy far behind at this sleek, contemporary hotel, with relatively spacious rooms and apartment-size suites outfitted with Frette linens, iPod docks, and Nespresso machines. Bathrooms are heavy on the marble and mosaics, and shuttered windows with hefty curtains provide a quiet and perfectly blacked-out environment for light sleepers. A surcharged breakfast buffet is served on the rooftop terrace, which doubles as a cocktail bar at night. An affiliated restaurant, Assaggia, serves small plates of modern Roman fare in a similarly chic atmosphere.