Stop looking. I'm telling you. Book this place. This is a long review, but worth the read. I'm from the US, have traveled all over the world and stayed ta 70+ Airbnbs. From the moment we turned onto the palm tree covered driveway, we felt 100% at home and completely forgot the long day of travel with an infant and taking 3 flights to get to Placencia. The 30 yard driveway feels like driving through a thick jungle, which is a nice barrier from any street noise and makes the property feel incredibly private. The home itself is luxurious from every angle. It's gorgeous and well maintained, very spacious (for 7 adults and an infant) and 30 feet to your own private beach. Palm trees on either side of the property also made it feel even more private. There is a small home next door that was not occupied while we were there. We literally saw no one while at the house and also had privacy from one another because the home is so big. We had 7 adults, but the home could have fit 10 comfortably. The home was immaculate and the kitchen was very well stocked. AC was cold in the rooms, wifi was extremely fast (3 of us were working from the home and had zero issues) and the pool was perfectly maintained. One of the other benefits of staying here was the property manager, Albert who felt more like a neighbor you have known for 20 years. He would stop to talk to us whenever we had a question instead of just texting. He was incredibly knowledgeable and helpful with booking an INSANE snorkeling experience (Laughing Bird). His wife, Francee was the house cleaner and also extremely friendly. Even their dog Archie was friendly and added to the feeling of being at home. Dave, the owner was also extremely responsive and helpful.
Nuts and bolts: The only thing I can think of to consider would be if you have elderly people in your group. My parents are 65+ in good health and my Dad had a little trouble with the staircase. By no means did this take away from our trip. Just something to consider! I recommend renting a car, as there are not many things in walking distance (I think this is a plus for privacy!). Groceries are a 5 min drive down the road, airport is the same. Water out of the tap is drinkable, kitchen is stocked with spices, etc. There are baby beach toys and a pack and play.
I don't know what else to say. Trust me. Book it!