Hello Natsuko san,
Thank you for your comment.
I understand why your son does not like the dorm manager there lol
Are there anything in particular that you want to know about my student exchange program experience?
Is your son fluent in Japanese? Even if he is not I think the English level of students at Keio University is extremely high. Might be good to join a club other than tennis (a club for mainly drinking at Keio)