I stayed at Mirella's for a week in mid September with my wife and 4 year old daughter. Mirella's place was fantastic! The A/C was a lifesaver for the very warm week and the washing machine / dryer combo made it so we could travel light and launder quickly. The location is in the heart of the tourist area which has its plusses and negatives but Florence is so compact that it was easy to reach everything we wanted to do on foot because the flat was so central. To call Mirella kind would be an understatement. She worked through 3 sets of canceled flights and changed train times. She met us at the flat even though we arrived late in the evening and she even purchased some groceries for us since we were due to arrive after the local shops would have closed. Yes this place has stairs, but there is also a nice lift if you'd rather. Think of the stairs of a nice excuse to get the larger gelato :) This place has everything your family needs for your stay in Florence. Just book it!