Dario and Francesca are a great couple that helped us lots while in Firenze. The flat is located at a very short distance to the train station, which is great since the most complicated matter is to walk on old stoned streets with heavy luggage. The appartment is located in a 3rd floor with no elevator, but the stairs are not difficult to climb (you'll appreciate how easy they are after you climb the bell tower).
The flat was clean, everything worked well. Dario and Francesca left some sweeties for our breakfast, all in all we had a great time in Florence.