re: Rome then Tuscany- places to eat

Best place to get really current eating recs in Italy: Katie Parla's blog LINK
She also has an app.
My favorite thing to eat in Rome is pizza bianca or pizza rossa. Not pizza as Americans think of it, but rather an only in Rome flatbread. The bianca is very simple, topped w/olive oil and a few flecks of herbs. It's a cousin to focaccia. If I had a couple of kids in tow, I'd hit up the Antico Forno on the Campo di Fiore for pizza bianca & rosso. The Campo hosts an outdoor market, so lots for kids to see and space to move in, and the Antico Forno cranks out fresh p.B all day long. Around lunchtime, Antico has a side shop (across the vicolo/alley) selling simple sandwiches. 10 euro will buy a picnic feast. You can perch at the base of the Bruni statue nearby to eat, or walk the short distance to the Tiber embankment.

Not too far from the Campo is the Roscioli bakery: https://www.salumeriaroscioli.com/bakery/
You can get a porchetta sandwich (and you should), as well as cookies, bread, simple sweets.

A good traveler's tip for Roman bathroom access: practically every block has a coffee bar, and you can suck down an espresso standing at the bar (1.50 euro) while the rest of your party uses the facilities.

Where in Rome are you staying?