The attic apartment was fantastic in many ways: beautiful patio, spacious for 2 people, comfy bed with great linens, great shower, very clean & included basic kitchen tools/necessities. Communication with Florence Concierge was easy with quick responses.
We stayed for 3 nights and the only significant drawback we found was that it can get pretty noisy at night given it's proximity to a few bars/clubs.
Expect lots of stairs to get up there: buildings are fairly tall in Florence and it is on the top floor of a 4 story building. It's good exercise to counterbalance the delicious florentine dishes you will find throughout the city!