I recommend Bert Lozada Swim School. They conduct their lessons in one of the indoor pools at Ace Water Spa in Kapitolyo. Check out their website for rates and other info. http://www.bertlozadaswimschool.com/
I believe the closest accredited and reputable location that teaches swim lessons for younger kids is in QC. Here's a link to the indoor pool's website. Hope that helps! http://www.chitorivera.com/