Specifics about this place have been hard to come by on this forum, and it's still a changing work-in-progress. Some of your specifics (refrigerator size, taxi service, etc.) could be best answered by the concierge there, who answers emails quite promptly: I think it's firstname.lastname@example.org -- check the website, mayanpalace.com
If you think you'll be going to PDC a lot, and want to have the liberty of exploring, most posts have recommended renting a car. As far as your other questions, if you do a search on each topic, you'll come up with an abundance of info & suggestions.