Alessandra is a very welcoming host, she was all the time available on the phone prior our arrival. She showed us around the flat how everything works,. The apartment has everything new, including kitchen appliances and even some tea, salt, pepper. olive oil - things you would need to buy anyway if you want to cook our own dinner like we did. For us this was a plus.
Bathroom is shiny and big enough, and towels are provided. For four people I would say the apartment is a little small, but we were 4 and for a couple of days this is not a problem at all. It is ideal for two to stay.
Cannot comment on the hitting, we did not need it. The windows with shutters do the job to block the noise, but you do hear some noise early in the morning from garbage collecting trucks - unavoidable in such a central location. It is 10 min to the Central Station walking, 10 min to the main Dom Catherdral, 5 min to the nearest supermarket on Via De Ginori. There is garage for parking right in front of the apartment but expensive (25eur/day). We googled a free parking in Galluzzo suburb of Florence on Piazza Acciaiuoli, bus 36 back to center.
Folding sofa is a little squeaky but provides reasonably comfortable sleep. Bed sheets had already been done by Alessandra by the time we arrived.
Overall it is a good stay for four, it is a fantastic deal for two!