Which ISI Language School campus is best: Shinjuku Prime, Shibuya Harajuku, or Osaka?

Hi everyone! I’ve narrowed down my options for an ISI Japanese language school to three campuses: Shinjuku Prime (Tokyo), Shibuya Harajuku (Tokyo), and Osaka. I want a school that offers a great balance between academics and having a fun social life. I really want to make friends and enjoy my time outside of the classroom. If you’ve attended any of these specific campuses, I’d love to hear your thoughts on which one you think is the best and why. FYI, it would be for a short course (like 2 or 3 months)