ZTL areas
Ciao -
I apologize, perhaps my suggestion wasn't expressed properly. I had want to communicate that there are lots of places to park in Florence before you arrive in the ZTL zones which don't require you to take a tram or bus to see the city center.
Most towns do have some kind of ZTL zone - however, looking online in Italian I see nothing indicated for Scandicci and the tram station is not in the center (which is where most ZTL zones are oriented). I know from talking to owners of B&Bs in Scandicci that the train station is easily reached and they never mention a ZTL zone.
I hope this is of some help,
Donna Denise