Posh boutique hotels have been sprouting up with Starbucks-like ferocity. But for the ultimate experience in luxury and style, nothing in Boston compares to Nine Zero. Credit the staff’s unerring and gracious service, a sleek, funky design, and luxury amenities including Frette linens, custom request minibars, and personal shoppers. From Spire, the stunning second-floor restaurant and bar, to the sleek marbled showers in each room, every inch of this unique locale is designed to relax and entice. A study in soft contemporary living, the accommodations are even reasonably priced; rooms average $239.