Besides 張祝珊, there are some other Nuseries in Choi Hung/Choi Wan, e.g. Po Leung Kuk Ping Shek Nursery, you may also check and compare.
I applied 張祝珊 for my elder son before when he was 2, 張祝珊 admitted him, but we didn't go because I prefer to have a larger areas (especially open areas) for kids.