We stayed at Alessandro's apartment July 5-8 and it was perfect for 2 adults and our two children. Our journey from Pisa airport was longer than expected and he waited a long time for us to arrive and then showed us how everything worked in the apartment and gave us lots of recommendations for places to eat, gelato etc.
You couldn't pick a better location to explore Florence - almost out of the door is the Piazza della Signora and the Uffizi and it's a 5 minute walk to the Duomo - right in the heart of everything. The apartment is beautiful as pictured, clean, well appointed and with very effective air conditioning (we did not find this to be the case at other places we stayed in Italy that had AC but barely did anything to cool the room). We really enjoyed Osteria della Condatta further down the street from the apartment and Venchi gelato a short walk away. Highly recommend!