The Grand Beachfront Villa is the Le Morne house on the St. Regis page. That page is the named source. It says a family space that accommodates up to twelve guests, in four bedrooms. A Villanovo page for the same villa says up to 16 people, counted as 8 adults and 8 children under 12.
What the source says
The St. Regis Le Morne page describes the Grand Beachfront Villa on Le Morne beach as four bedrooms, each with an ocean-facing terrace. Three of the four suites have private pools. It lists a heated infinity pool, indoor and outdoor lounges, a dining area, a gym, a sauna, a private dining room, a professional kitchen, a private chef, and a senior butler available around the clock. It says a family space accommodates up to twelve guests. The address block is Coastal Road, Le Morne Peninsula, Le Morne, Mauritius. A Villanovo page for a Grand Beachfront Villa at the edge of the same resort, checked the same day, heads the house as 8 guests with a maximum of 16, 4 bedrooms, and 5 bathrooms, and says up to 16 people counted as 8 adults and 8 children under 12. That page lists an office with a desk, computer, print, and fax, a dining table that seats 16, high-speed wireless internet in the bedrooms, and two twin-bedded rooms in the service area for up to four people in a travelling entourage. It also prints both 1,659 square metres and 1,648 square metres. Events on that page need prior approval. Quote twelve from the St. Regis page. The 16 count is the Villanovo figure, and it includes eight children.