Choose what city to study in

Hello,

I'm planning on going to japan and study the language for about 6 months next year (starting jan) and I was looking up some different cities.
I've visited Tokyo, and while I really enjoyed it I feel like I wouldn't want to be there for 6 months to study japanese.
I'd rather choose a smaller city.
The available cities are: Fukuoka, Gifu, Kyoto, Nagano, and Sendai.

For some reason I'm into Sendai, mainly because of the climate. Not too cold and not too hot.
But I do not know very much about them other than what it says on wikipedia.

Anyone here feel like telling me which one of these I should choose? And why of course.

Thanks

Sendai can get pretty cold from a Tokyo-ers perspective, but generally speaking, a lot of locals say that it's a comfortable city to live in. Go for it!