Literally beside the Duomo, and in-between Duomo and Galleria dell'Accademia. Location is excellent, and nearby (very walkable with bags) from the main train station.
Only con (if you can call it that) is the tons of tourist human traffic everytime you come and go from the apartment. Comes with the location being so central. Minor noise ad night as advertised, not much of an issue for us.
Apartment is extremely modern, secure, and has everything you need to explore the city. Good shower and wifi internet.
Azadeh let us check in a few hours earlier (much appreciated) than scheduled, and gave us excellent tips on what to see, eat and do nearby.
Overall, a highly recommend base if you want to explore Florence and walk around to everything.