I am not familiar with this apartment, but it is advertized as wheelchair accesible and has an elevator https://www.vrbo.com/1457504a?dateless=true&x_pwa=1&rfrr=HSR&pwa_ts=1714764643828&referrerUrl=aHR0cHM6Ly93d3cudnJiby5jb20vSG90ZWwtU2VhcmNo&useRewards=true&adults=2&regionId=787&destination=Grand%20Case%2C%20Saint%20Martin&destType=MARKET&latLong=18.101494%2C-63.055046&searchId=d04b3c34-276b-477e-806a-e60edd9001c6&privacyTrackingState=CAN_TRACK&accessibility_features_group=wheelchair_accessible%2Celevator&sort=RECOMMENDED&userIntent=&expediaPropertyId=33739285

We stayed in an airbnb with a garage underneath the building and an elevator, so it it possible that would work - though getting out of the garage onto the street was very dicey unless you had one person stand on the sidewalk or street to check for oncoming traffic. For either place, the sidewalks are too narrow and in poor shape for a wheel chair, but you could drive a few minutes to the parking in town. Even if you don't go swimming, the views from the places on the beach are quite nice.