This must be the best place to stay in Firenze; bestest value for the price, best location and by far the best host you can find in the city! Mariantonietta took great care that everything was perfect with her warm touch. We managed to see each other only twice, but in the flat (which is huge, pristine and airy) there was always this sunny generosity of hers in the air - 2 towels and a bathrobe, breakfast waiting for you in the morning, pillows of different thicknesses, blankets, soaps and shampoo, and the led lights she leaves at night for you to get to your bedroom. Feeling at home like this I will come back for sure!
On the practical side, there are a bunch of steps to get to the flat (I travel light so not a problem for me), and as the streets of Florence are quite noisy, if you're sensitive to sound at night I'd recommend you bring along your ear plugs, which I did by recommendation of another review down here! (thanks!)
Mariantonietta was super helpful with check-in (as I was a bit delayed) and super laid back with check-out (I had gone out the evening previous..), the location is fantastic - very close to the train station and Ponte alla Carraia, with shops and cafes at the door in a neighbourhood more similar to the actual Florentine life than to the absolutely touristic bits of town, yet a 10 min walk to the Duomo (and about 5 min walk to one of the best gelaterias..), all this for a great price. 10 out of 10!!