Mexico City is a seether, a polluted series of highways and skyscrapers. But it’s also a leafy network of ancient canals, tempting tacquerias, markets and churches; a blend of the Aztec, Baroque, colonial and commercial. For the meandering tourist, the greenest prospect presents itself in the residential, boutiquey district of Condesa, east of the centre, with a cool, downtown New York feel, all interiors boutiques and cafés.