Your Rome and Florence hotels are in the cities, just not as central to the tourist areas, so some may be having difficulty suggesting dining options nearby. since these are more residential neighborhoods, you might find some good local options.

Your Venice hotel is on the mainland beyond the airport, at best a 20-minute drive from the island of Venice in an industrial suburb. With summertime traffic, it will be a much longer drive. There are some local bus options in the area, but it might require connecting to more than one to make the trip to Venice, and have schedule restrictions. A taxi for your family will be your best bet.

Thank you! This is helpful info! I will know to look for dining options near our afternoon excursions so we can eat before we come back to the hotel instead of going back out, if possible. Thank you!