Concierge.com's insider take:

Born as the 16th-century seminary of San Antonio Abad (itself built on the site of a former Inca palace), the Monasterio is one of Peru's most gorgeous hotels. Because the original architecture has been largely preserved, no two of the 127 guestrooms are alike. They range in size from the monastic (these were monks' cells, after all) to the presidential, in the form of sprawling suites. But each is well-appointed, blending modern facilities with Spanish colonial (heavy wooden shutters that swing open to reveal the city's copious supply of cupolas). Most rooms can be oxygen-enriched for a small surcharge, to help low-altitude-dwelling lungs (you're at 11,600 feet here). Another comfort enhancer to consider: Any of the soaks on offer from the resident Bath Butler. One good choice is the Qeros Bath, which comes with a glass of coca sour, a Peruvian cigar, scented candles, and antistress bath salts.