My mother and I visited Florence for the first time in March, 2013. We stayed in Francesca's apartment for 1 weeks. Rosa met us promptly on time. The location is easy to find from the train station. I loved the neighbourhood. It felt safe and was very close to all the sites that we wanted to visit within walking distance. We even took a cooking class that was 6 min to walk to.
Positive: great location, clean apartment, convenient to have two bathrooms, everything that you need for cooking is supplied and don't worry about the hair dryer! It was there. You can hear the neighbours but they are not loud pass bed time.
Negative: as mentioned before one bathroom has a bath tub but it would be nice to have a curtain so it can be used without splashing when showering. There was some sort of construction going on in between the apartments in the window passage for two days. So we we woken up pretty early. The bed is hard and I would recommend softening it with a pad. There are no elevators so it was hard getting heavy luggage up the stairs.
Overall, the apartment has everything you need and Francesca and Rosa are very kind and accommodating people.
I would stay in the apartment again.