Robert and Ruby are some of the the kindest, most gracious AirBnb hosts (and honestly people in general) that I have come across. I had a somewhat unfortunate situation come about and they were readily available to assist in any way they could (and they did). I can't express my thankfulness enough and I greatly recommend staying at their place to other folks!
Please do yourself a favor and book with these folks if you're staying in Mexico City :)