This flat was exceptional - incredible views, centrally located and well organized for a guest stay. And Stefano was an amazing host - warm, helpful, and really took time to talk about his Florence, available for questions. He starts you off with all kinds of written suggestions for dinners, sights, and experiences.
We stayed for 3 nights, and between the views, the location central to so many of the sights, and the comfort of the flat we often picked up a panini and came back to the flat mid-day to eat lunch, view the city, and chill a bit before the next round. We also had our aperitivos up there every night, and the bar downstairs across from the entrance is more than happy to sell you spritzes to go :). There's a grocery in easy walking distance, too.
While there is a lift to top floor, the flat itself has a lot of little step ups and down as well as short stretches of steeper steps in and to the top deck, so it's not the place if you have mobility challenges. But if you are fine with the steps, there's no better place (especially when you compare the costs of hotel rooms with Arno views).