Donna's flat is in excellent location right in the middle of the Florence city centre. From here, you can walk to all the main tourist attractions within 15-20 minutes.
We had a great time in Florence and Donna's place provided a very comfortable accommodation for our family of 6.
The only downside for us was that we had a car which we could not use as there are restrictions in the town centre. So, we had to leave it in a garage close to the flat for 2 days and pay around 30 euros per day.