The place is located in a modern building. There's a lobby with many security guards so totally safe. The neighborhood itself is quite safe, by Mexico City standards, but not as much as Roma Norte/Condensa I think. During the day you can easily walk to Roma Norte, Condensa, Centro historico, and other places of interest. At night, I felt safer taking Uber.
The apartment is nice, even though not as pristine as in the pictures (some peeling paint for instance). The fridge makes a terrible noise. Fast and reliable wifi.
Javier was really responsive and helpful. Unfortunately when we arrived there was no water in the apartment (there's no water filter) and he arranged for someone to bring us water bottles and beers the following morning.