Depends which kind of room, Standard and Bungalows up to 3
De Luxe and Honeymoon up to 5
Villa Beachfront at max. 10 persons
Apologies for not seeing this question for so long. Bernie has answered the question adequately, so no reason for me to add to it unnecessarily.
Our stay in one of the main rooms inside had the three of us in our room, which was easily good enough, as it had two beds.
I'd happily stay in same room again, which was located inside the main part of the resort, and close to the owner's room.
Enjoyed our stay there very much.
Get an answer from Phaidon Beach Resort staff and past guests.