A vacation to watch the Mexican Grand Prix ended in tragedy for one tourist poisoned by carbon monoxide, fueling calls for regulation of popular accommodation rental websites like Airbnb and Booking.com. -So far regulations introduced in Mexico City for online vacation rentals have been limited to the issue of taxes. Mexico City Mayor Claudia Sheinbaum has assured people that rules are being drawn up for the sector. Hector Flores fears that he will have to find a new home when his apartment rental contract expires in August. The 30-year-old playwright and his roommate, a freelance actor, pay $500 a month to live in downtown Mexico City.