This location can't be beat - it's walking distance to so many great sites, and the neighborhood is a gem itself. We're very glad we stayed at Antonio's place, and while we recommend it there are a few things to know:
1) He lives in a dog-friendly building, which is great, but there were several instances where dogs were just going crazy barking for over an hour at a time when we were trying to relax. (Obviously nothing Antonio can do that that!)
2) The bed in this apartment is incredibly hard. Not to the point of discomfort, but like surprisingly weirdly hard. We didn't get out the sofa bed to use instead, but it was discussed...
3) As Antonio mentions in his check-in list, the hot water does take a few minutes to get there in the shower (faucets seem to be fine), and there's also a finite amount of hot water at a time. Plan your showers accordingly - my wife and I found this out the rough way.
These were minor inconveniences scattered throughout a fully enjoyable stay. If we return to CDMX, we'll definitely consider staying in this location again due primarily to the excellent location and value.