I've been in Le Coco beach twice and for me its been a nice place to stay- although its not a "quiet" hotel. If you want to have total peace and relaxing I would not say its the perfect place to be- cause sometimes bigger groups of guests stay in this hotel.
But if you want to go to a really colourfoul hotel (its beautiful) with a very nice huge garden and several differnt beaches i think you're right there. About children I can only say- the manager is an Italien and he loves children. So this hotel really offers lots for children in every age.
There's one beach which is very good for small children cause its completely surrounded by a reef- like a little bath tub at the beach
and also the pool has a shallow side like a beach. well just ask me if you wanna know more ok.