Where to spend our month in France

Hi everyone,

My partner and I are taking a few months off work and looking to spend at least one of them in a fixed location in France getting to know a small town or city and improving out French.  I know there are countless french language schools we could enroll in, however they are all quite pricey so I'm hunting around for alternatives.   Either a local school or community college that maybe doesn't charge so much, or possibly just volunteer or work opportunities that would allow us to practice and learn less formally (we both speak and bit, and also are fluent in spanish).

We'd like to be in the south and/or near mountains and are okay with either a town or a city, not too particular. Just looking to avoid spending a fortune so we therefore thinking somewhere a bit smaller/not touristy for that reason.

Thanks!

Cam