Need Destination Advice - Beach + Food

I'm looking to spend a few months living and working (remotely) in France - possibly over two trips (one in the cooler months and one in the warmer months). I have the legal right to live and work in the EU.

I'm having a hard time narrowing down where I might like to base myself. My criteria are:

• Walking distance to clean and swimmable coastal beaches
• Walking distance to a reasonably-sized supermarket or ideally, a large supermarket
• Preferably a local farmer's market at least weekly
• Convenient transportation connections by train and bus to other cities and towns

So far, Antibes checks most of my boxes but I'm looking to base myself somewhere new and possibly slightly less touristy. I like Marseille but don't find the nearby beaches very clean, and I just don't really like the vibe in Nice. I'm wondering about going further west, towards Spain? I have spent a lot of time in Barcelona but not much time on the coast between Barcelona and Marseille. I'm also open to other coasts in the warmer months if the swimming conditions are good and the water temperature is comfortable.

I'm not on a tight budget but of course things like a villa on Cap Jean Ferrat are out of the question.