Our family of 4 had a wonderful 3 day stay in Florence at Adele’s apartment. It is huge with plenty of space for the kids to spread out, a park and grocery store within 5minutes, a beautiful local foodies market that Adele will tell you about is 10minutes in the other direction. We walked everywhere except when arriving and leaving with large suitcases (easy taxi €15 from train station) but bus was also an option. Florence is beautiful - the view from the Duomo dome well worth the climb - and get out into the Tuscan hills if you can.