Our stay at Guillermo and Ana's place was great. Ana was available via What'sApp consistently, and offered detailed directions to the apartment to show our uber driver from the airport. Given that the apartment complex was located on a busy street, this was very helpful. The place offers great value for money with all of the basics covered.
Of note: the walk to Citibanamex is along a busy highway. If you're expecting to walk to the conference center, I would choose another place. I found uber a cheap and easy alternative.