We loved our stay at Bianca's flat. It is exactly 1 mins from the Duomo, which is quite fantastic. The flat was really cute and tidy.
Bianca also gave us restaurant recommendations and were flexible about check-out.
It is a perfect place to stay if you want to be in the center of Firenze.
We had trouble sleeping as in the early mornings there were garbage truck beeps, pump cars etc below us in the street, but this is not the flat's fault, you just have to calculate these kind of things next to the Duomo.
Anyway, we loved our whole holiday :)