This sounds like an RCI exchange to me as well.
If you are renting this from someone, a friendly warning. RCI members are specifically forbidden from renting the exchanges they obtain. Of course, that doesn't mean it never happens, but if RCI (or DVC) get wind of it, the exhcange can be cancelled, the member's account suspended, etc. This has actually happened to people who have reported the experience on TUG and TS4M, two timeshare discussion boards.
So, tread carefully.