For rentals in the states, I always go to the county assessor's website and verify that the owner is the same person I'm dealing with. It usually takes less than 10 minutes. When the assessor shows a corporate owner, I go to the secretary of state's website, search for the company listed on the assessor's website as the owner and usually find that the person I'm dealing with is the registered agent or otherwise associated with the company. That usually takes another 10 minutes. A month ago I was able to verify that a Miami rental unit was owned by a Miami newscaster and absolutely was not owned by the person with whom I was dealing. So I moved on. That was not the first time and I expect the fraud will increase over time. Unfortunately, I don't know a similar way to verify ownership on the island. So, for the St. Barts rental, I looked for good reviews, called the posted phone number and used Paypal.