I would give Mario's apartment six stars if I could. He is an incredible host, super helpful and available for everything. He even gave us fantastic recommendations of where to get good, typical Florentine fare. The apartment was clean and comfortable, it even had a sweet little balcony with a table and chairs perfect for colazione! It's in a nice, quiet residential area about a 20-25 minute walk from the city center. I would recommend this place to anyone staying in Florence. Grazie Mario!