international school question

I`m not sure if this is the right forum to ask this but here it goes. Our kid is turning three soon and we would like to send him to an international school (even better if it`s a Montessori school), however we live in Ueno and most of the international schools seem to be either on the west or south side, we both work and an hour commute both ways is too far for us. I`ve been doing some research but nothing beats recommendations from parents. Does anyone here with little kids have a good exprience with an international school that is within a 30 min ride from Ueno? (this includes a large portion of Tokyo, especially considering that we have so many subway and JR lines close by). Thanks in advance for any reply!

by Distinct_Turnover932