Alex y May have been the best hosts I've encountered through Airbnb thus far. Though I never met them face-to-face, they responded to all inquiries immediately and provided a plethora of helpful recommendations. Check-in was made easy, thanks to the 24-hour doorman. Their apartment was clean, modern, and tastefully decorated--the carafe of purified water was an especially nice touch. The location was also prime: right in the heart of Centro Historico and within an 8-minute walk to several major metro lines (green, pink, and blue); also within a 10-minute walk to the Zocalo and the Bellas Artes--a really ideal, central location. Although the apartment is in the middle of downtown, which is quite busy, the inside of the apartment was very quiet. I'm a light sleeper and couldn't hear any of the street traffic. Can't recommend their apartment enough!