Cafe Especialidad in Roma Norte (Queretaro y Orizaba):
It's a little coffee shop connected to La Roma Cafe (which is just all right).
It's got to be the best place for espresso in the city. Elsewhere, most people don't know shit about coffee. You could order espresso and get watery coffee at some places. The guy who owns this places knows his shit. He had beans from several countries and could out-barista any hipster in the U.S.