Thank you all for the flattering comments.
For Lilia, yes, I was in Mexico in April, in fact the curse of Montezuma hit me in a unique way: on my return to Italy, all the computers in the house of failure at the same time.
For the record, San Cristobal de las Casas is a beautiful town in the state of Chiapas, is pretty much the equivalent of Cuzco in Peru.