Michele's flat is lovely and has even higher ceilings that what you see in the pictures. It's very central, but central Florence has become so incredibly touristy (partly as a result of Airbnb!) that I would probably not stay in this area in the future -- you actually only encounter other tourists and the local cafes are prone to ripping off tourists, like in Rome. This never used to be the case in Florence. Other neighbourhoods, on the other side of the river, near the Porto Romano, are much less overtaken with tourists, and as a result, offer a less Dinseyland experience.
All that said, the flat is perfectly comfortable and pretty. I would be careful about add-ons, as I added a guest onto the original reservation who was ultimately not able to come, and only received a fractional refund, which was disappointing.