As of September 2017, this apartment is adjacent to a nightclub, which is open from Tuesday through Saturday nights. Its loud music, smoking patrons, and associated police activity disrupted our sleep between 11 p.m. and 3 a.m., even while wearing earplugs. Our low rating is based on this factor alone.
While we encountered an additional issue during our week-long stay (a broken lock that required a locksmith), we felt that Humberto was receptive to both concerns -- although he also seemed to have trouble believing us on both fronts, which felt frustrating.
Nightclub nightmares aside, this is a lovely and clean apartment on a bustling corner (for us, the street noise doesn't make this a "quiet" apartment, but it wouldn't bother everyone). We loved being able to explore Condesa, and to walk for groceries, meals, and other sight-seeing. Humberto cares about his space and the people staying there.