Until fairly recently, Mexico City’s most in-demand hotels were found in one of two areas: moneyed Polanco or along the skyscraper-lined Reforma Avenue. But over the last few years, a number of small, independent properties have emerged in the trendier (and expat-heavy) boroughs of Condesa and neighboring Roma, many of them moving into the graceful old buildings that characterize this verdant pocket of the sprawling capital. The most appealing hotels in this new crop tend to favor low-key charm over unbridled luxury but in a part of town that’s notably serious about design, they fit right in. Here, three of the newest standouts.