Opinions/experiences with ISI, KAI, and KCP International language schools in Tokyo

Hello! メリークリスマス。I posted some questions about immersion language schools the other week and got some helpful responses. After doing some research I've narrowed down to three that seem to be good fits with overall great reviews. My understanding is that it is not a good idea to apply to more than one school, so I want to make my decision before I apply. I was hoping that some people with firsthand experience with any of these schools might be able to help me make my decision. One thing to note is that I am not planning to do this for any sort of financial prospects or continued education after, I just want to learn while taking some time off and working on independent projects (I am 31). One thing I saw about some other schools like Akamonkai and Senmongakkou were negative reviews about being treated like a child or lack of flexibility or lack of conversation practice which is what I am most looking for. For the three I listed (or others), can anyone with experience with them please tell me a few things about the day-to-day experience (how much time spent kanji, conversation, grammar, how many hours a day, etc), if you felt the school was flexible, the demographics of the other students and if you thought that was beneficial for you or not (eg. many Chinese students may put you behind in kanji, or many Western students result in a slower learning environment, or something), and the availability of additional immersion experiences out of school (field trips or other school events)?