Just got back from a great 7 days at Mary's Boon on Simpson Bay. I also am very affected by mold and I can tell you that every building at Mary's Boon is concrete now and not any sheetrock on the property. Most of the rooms are very open and sunny but they do have some lower rooms that have dehumidifiers when needed that I have seen but never had an issue. I'd say Beachside also has rooms that are open and sunny. Simpson Bay beach really looks great now and the island is just getting better. So happy we did not cancel cause I hated coming back to the cold and nice to get some sun again while on St Maarten. I do know they are very full all season so it might not be easy this year to get a reservation but sure worth going if you can get in.