The location besides the Ponte Vecchio is amazing and the apartment is just like shown in the pictures. Everything is very clean and working fine. It is very close (walking distance) to all interesting points and attractions (there is also a little supermarket just around the corner with everything we needed).
Cristiana is a great host and very communicative. The check in was very easy, she explained how everything works on the apartment and gave us a lot of local tips for our first visit to Florence.
If you are in doubt where to stay in Florence, I really recommend Cristiana's apartment.