This is a great apartment within walking distance to main attractions, restaurants and shopping in Florence. We were greeted by Mr. Lombardi, an eccentric man who lives downstairs. There are some stairs required to reach the apartment.
The apartment had good amenities. We took advantage of the couch, two tables, coffee machine, kettle, washing machine and drying rack. Note that the apartment is in an old building, with the bedroom facing the street front and bathroom/kitchen at the back. There is not a lot of natural light at the back. We also found the walls quite thin and could hear heavy footsteps in the apartment above, as well as street noise from the bedroom. However, we did stay during the busiest time of year!
We would recommend Guido's apartment for a short stay in Florence, but for 5+ nights would look for somewhere quieter, as we personally found the apartment too noisy to sleep in.