Lapo was incredibly responsive and helpful - he also gave us great restaurant recommendations which we took full advantage of! The apartment was really cute (and clean) and the building is absolutely amazing - really gives you a sense of the history of the area. The apartment also had air conditioning which was a lifesaver during the August heat wave! The bed was really comfortable as well.
I highly recommend Lapo's flat, unless you have difficulty with stairs (there are 2 flights of steps after the elevator). We will certainly stay again next time we visit Florence!