What week do you need?
I have used TUG to rent units for my family or to rent out my units for many years. I have never had a bad experience.
This year I have listed my Royal Mayan week 52 on TUG but until the May 15th would consider renting out my week 51 at the Royal Sands instead if someone preferred that week..
Recently I tried an exchange with someone who wanted to deal by email. They had an unlisted phone number and would not provide a home address. i refused to do business with them.
When I am paying for a unit, I always verify ownership from the resort, require a substantial deposit and insist on a home phone number and address. When I rent my unit I give my renter enough information about me to feel comfortable.