While I agree it’s risky if you’re renting both sides, but if you’re there to speak with a manager if necessary it’s unlikely to be an issue.
Since there was a question about policies at other resorts, while I have not personally done it, I know every time I check in at the Aruba Surf Club I’ve been asked if I wanted the keys keyed for both units, so presumably I could opt to key them separately.
The bigger concern of a single reservation number is that there have been many reports of problems with charges not getting separated properly even when people have requested that and left different credit cards upfront for different sides of units on the same reservation. I don’t have personal experience with it but have seen many reports, so that’s a risk; an annoyance when traveling with a friend but a risk if with a “friend.” If it’s an owned unit if might be worth the lock off fee (free with enrolled weeks) to eliminate the risk of sorting out room charges
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