Mirandabad is a really nice pool, there are a few different pools in the complex but the family area is great. Combining different depths with 3 slides and a wave machine makes for a great day, they also serve food.
It's always full of people use the outdoor pool during the summer. But you still can use te indoor pool. There are different programs for every ages, from baby till elderly people. The location is easy to find. From Amstel station, the bus number 65 will bring you to the Mirandabad. Price is affordable.