We had a wonderful time in Florence and the apartment is great in many ways. It is exactly as pictured. The views from the windows are breathtaking. The kitchen is well equipped if you want to cook. There is plentiful hot water and pressure in the bathroom. There are a lot of stairs as other reviews note - it's not too bad and our 6 and 10 year olds did not complain (much). Isabella was a welcoming host and it was great to meet her.
The location is 10 mins away from most everything - galleries, Ponte Vecchio and many other wonderful sights, and some very good areas for great food. The location is also very noisy and this was the only down side. The noise from the piazza below goes late in to the night (2am at least) and it will sound like it is right in the room. This was the week after Christmas so a busy time in Florence. In all we enjoyed our stay but longed for a quiet night of sleep.