This apartment is ok. I stayed there with my father for a week. It is serviceable, and the neighbourhood is wonderful, next to a number of beautiful squares full of excellent restaurants and cafes, and lovely local nightlife. A bit removed from the most touristy areas of Florence with a relaxed atmosphere but still very convenient, and a short (10-15) minute walk to anywhere we wanted to go.
The apartment itself is fairly basic. We didn't use the kitchen, but it is very small and there is only one plug for both the microwave and the coffee machine. The furniture was ok but the cloth parts were a bit stained. (There is a stain on the upstairs bed.) I know this is a very American complaint, but the shower is very small and hard to navigate - it is hard to turn around and there is no where to put soap - it had to stay on the floor. There is no counter space in the bathrooms next to the sinks. There were a number of problems with the apartment when we arrived (the air conditioner was broken, we only had one set of keys, the drain in the shower didn't work) - the manager was very responsive and did her best to fix them, but it took most of the week to get everything sorted out. Overall we had a very nice time, and the apartment is convenient and had everything we needed, but it is not super-comfortable.