Visiting Florence this summer.. Staying in Pisa free on points, so Florence will be day trips. After touring all day with a kid, I am assuming we are going to be tired, hot and hungry early in the evening, around 7, and needing to return to Pisa, so late dinners not an option. Will we be able to walk into a trattoria that early, around 7, without a reservation? Will they even be open? I have a list of places in the Oltrarno. Thank you.