Ciao maminutelli,
I can recommend in particular a restaurant called Quinoa, close to the Duomo and the train station.
They are specifically a gluten free restaurant and offer several vegan choices.
I discovered it only this year and it has quikly become one of my favourites. The location is also very nice: it's set in the courtyard of palazzo and with the good weather of July is particularly nice eating outside.
You can see more and even reserve here:
https://visitflorence.thefork.it/ris.../quinoa/204555
Hope you will enjoy it as much as I do

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