Constance Belle Mare is the nicest resort I've ever been to.
The staff is extremely nice and welcoming, they smile and say hi every time. The rooms are spacious, luxurious and there's even a night turndown service.
The resort itself has many high-quality a-la-carte restaurants, and a main restaurant where you can have delicious breakfast, lunch or dinner. There are many sun-beds on the beach, and they are also high-quality, made from wood, not plastic like most resorts...