hi Bronx,
for a studio/appartment check out on Robert, even that's a bit last minute.
his contact is Robert Hill
Apartamentos Mar Tropical
rob-hill123@hotmail.com
1-809-850-6610
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otherwise you'll always get a room at the Cortecito Inn in El Cortecito,
around $60.- per room per night(can be 2 adults per room) with breakfast included.
you can contact them on 809-552-0639
good luck
Mike