A very nice, clean and modern apartment in a great location. The neighborhood is very upscale, clean, and safe. Ubers are <5 min away, and it's about a block from the Polanco Metro station. The wifi was pretty slow, but I don't imagine there's much to be done about that. The beds were decently comfortable, nothing in particular either way.
Having the security guys there round the clock was very handy, as we got in around midnight and they were all ready to help us get set up, and were happy to help us with our luggage.
The one thing to be aware of is that the apartment is a third-floor walkup up a spiral staircase. Since the air in Mexico City isn't great and there's not enough of it (7300 ft elevation!), this isn't a great option for people who have health or respiratory issues. But if you're game for the stairs, it's an excellent choice. I would definitely recommend the house and the host.