Very nicely and modern furnished/renovated appartment, which you would probably not imagine when standing in front of the entrance door. The street is busy, but thanks to a good insulation you won't notice anything of it if you keep doors and windows closed. In combination with the well functioning airco in both sleeping and living room, the appartment was very cool in spite of the 35° outside.
Kitchen and bathroom are also very modern, clean and well equiped. Beds (both the double bed in the sleeping room and the convertible sofa in the living room) are of excellent quality.
For people who don't mind walking (which I assume you don't, coming to visit Florence) I find the location of the appartment pretty okay : depending on where you want to go, it will take you a 15-20 minutes stroll to the main attractions of the city center on both sides of the Arno. Public transport is available as well and there are buses in abundancy, however they do not travel fast due to lots of traffic... so sometimes walking is more beneficial.
There are also a few good restaurants in the direct neighborhood of the appartment, we noticed, and they are not as overcrowded as in the city centre.
Finally, the landlord is a very nice and helpful guy, communicates well and his English is certainly to be considered as more than fluid.