I really recommend staying in Dorota's place. The studio is very clean and comfortable and we felt like at home there. Dorota left some wine, jam, pasta, spices and other stuff for us to use which was really helpful. The flat is located in a quiet residential area not interesting in itself, but you can easily and quickly get to the centre of Florence by public transport. There is a tram stop 7-8 minutes walk away and tram T1 takes 10-15 run to get you to the central station and it runs every few minutes till late at night.