Our stay with Alejandro and Pepe was truly one the best travel experiences my wife and I have had. They (including their friends and family we met) were incredibly welcoming and helpful throughout our trip.
My wife and I had the unfortunate timing of being in México City during the earthquake on 9/19. Once we made it back to our Alejandro's place, he made us feel incredibly safe until we flew out 2 days later. He additionally cooked the next several meals for us as most places were closed. He really, truly opened up his home for us like family. Had we stayed anywhere else, I'm not sure this type of response/help would have been possible.
I would recommend their airbnb to anyone--a wonderful experience with kind and genuine people (not to mention the location is perfect!).