This place is superb!
It's a hidden island with crystal clear water and white sand beaches. You can also do great snorkeling here, the corals are beautiful.
This island is empty, nobody lives here.
You can reach Air Island from Pramuka Island by renting a boat or from Semak Daun Island. From Jakarta to Pramuka Island it takes you about 1,5 hours and from Pramuka to Air Island it takes about 0,5 hour.
Note: Kepulauan Seribu is also known as "Thousand Islands" and Pulau Air is known as "Air Island". Air means Water in Bahasa Indonesia.