Anse Chastanet is by far the best value for luxury, amenities, and experiences in St. Lucia. Our room was visited 2-3 times daily by cleaners and staff (to make little transitions like turning on some lights while we were at dinner, tidying up while we were away at the beach/meals and replacing amenities like the complimentary water and local coffee). While Anse Chastanet is an affiliate property with the more luxurious Jade Mountain, all of the activities, beach access, and numerous restaurants were part of Anse Chastanet and thus far more accessible to us as residents here versus what we might've experienced at Jade Mountain (for anyone going back and forth on which place to book -- consider that).
Additionally, it is important to note going in that the food is very expensive on average ($40ish per person for each breakfast, $20-$50 for lunch, $50+ for dinner, and $16-$40 per individual drink) but the ingredients and dishes are incredible and all have a michelin-level quality to them. That being said, it is far more economic to utilize the "all inclusive" meal package as soon as you step foot there, which runs about $250 per person per day (sounds like a lot, but we easily ran $350+ each day per person eating and drinking normally, so this ends up being the best option in my opinion).
Overall staff were amazingly helpful and friendly, and the guests staying here are fun but enjoy their relaxation! I would highly recommend this stay to anyone interested.