International Schools Question NYC (New York)

Hi everyone.
We are moving our family of 5 to NYC in late October. Our kids are almost 3, 5 and 8. We are currently looking at both the British International School and World Class Learning Academy. Can anyone shed their experiences with either school?
Are there other options you think we should be considering. Our key criteria is that all 3 can attend the same school, and great all round academics,culture, social, & after school activities. I will be working 33rd St and where we live will be highly depend on school accessibility so any tips on housing/neighbourhood also appreciated!
many thanks Di