We had an enjoyable stay at the Residence Catalina, and the location simply can not be beat!! Right in the middle of all of the great restaurants, while not being next to or affected by any of the loud bars. We have visited SXM 10+ times or so, and we usually stay in hotels, but decided to try the VRBO route this trip.
Sebastien was excellent with communication, and any issues were addressed immediately by his onsite guy, Phillip (who doesn't speak very much English, and we didn't speak very much French! Google Translate was our friend!) We didn't rent a car, but if you do, the garage space is essential in Grand Case. However, we did notice several days that some people parked blocking our garage, which would have been a problem if we had rented a car.
This unit is nice and modern and we did enjoy our stay, but lots of little things made it just ok *for us* and brought us to the conclusion that we belong in a hotel...no tvs in the bedrooms, no screens on sliding doors or windows, blue bedroom shades don't go up, having to drag the uncomfortable beach chairs in & out of the dark basement, when we leave for lunch stinks. No sun on the beach side until noon. Lots of little bugs in the kitchen. There is a half bath in the hallway, but it appears out of order & is functioning as a storage closet.
Highlights include the excellent location, being right on the beach, the incredible view, sliding doors opening all the way up, a great little balcony, and plenty of space to spread out. Wifi worked well, and there were plenty of english tv channels to choose from. If we had been early to check in, or wanted a later checkout, Phillip said that we could have put our luggage in the attic or garage. Again, we did really enjoy our stay, we are just particular vacationers, so take my comments with a grain of salt ;)