We stayed at Marys Boon for 2 nights in August and found it to be a decent hotel. The airplane views are amazing and the beach access is awesome. You have to know going into it that it is in a pretty rough part of town. After you pass the "Bada Bing" strip club, you'll drive by a few abandoned houses, some broken glass buildings, a bunch of cars on blocks, and then a few sketchy side streets. When you get there, the resort is older, but cute.
The rooms are nice, but nothing fancy. The beach access is amazing, but there are several other hotels on Simpson Bay that dont require the less than desired neighborhood.
Next time we go to Sint Maarten, we will not be staying at Marys Boon. The hotel needs updating and the pool NEEDS to be cleaned out (we didnt swim once because it was just too dirty). I went into Marys Boon with realistic expectations, but, even though the manager and the staff were very nice, we were still disappointed.
At best, this is a 3 start hotel in a shady neighborhood.