I bought this set with some others in addition to a big playmobil pirate ship for my son's 4th birthday, and I'm so glad I did.
Of the 3 accessories pirate sets I bought, this one was the best value for money and had the most things. We love the little cave to hide the treasure, the hammock for the pirates to sleep, the flag and the boat. My son loves setting up all the pirates on and around the island and on the ship we bought and rowing back and forth and stealing the treasure from one another!
It's easy to put together and easy to use.
As with most 4+ Playmobil, it does have tiny weeny pieces that can get lost or broken easily, so I would say it's fine for a careful 4 year old or older, but might not be appropriate for a more boistrous child.
Brilliant set that would be a great addition to any of the pirate range or just on it's own.