The apartment is super convenient for sight-seeing and spotless, as many visitors have noted. The kitchen area has everything you need for making breakfast or cooking lunch or dinner. You will need to bring your own sugar, salt & pepper and other basics but there is a good-sized fridge and freezer, by Italian standards, so you have plenty of room to store perishable goods. The bedrooms are spacious with plenty of closet and drawer space, no street noise to interrupt sleeping, and the whole place is tastefully decorated. The washer/dryer combo was a bonus and they even provided detergent, though they said we could use our own if we preferred. There was a basket with guide books, Italian phrase books, maps and so on.
Stefano is terrific about getting in touch prior to the visit to make sure you know how to reach him and vice versa. We had to alter our check-in time and it was wonderful to be able to text an update once we caught our taxi from Florence airport. His son checked us in and walked us through the basics.
You can walk out the door and in a two or three minutes, find yourself at the Duomo or one of the many museums in the center of the city. We loved being able to come back to our place in the middle of the day for a bathroom stop or rest, or to drop off bags. Everything in the place was exactly as described. We needed heat rather than A/C, but both were available. Bring hand/shower soap and your own shampoo and conditioner. You may want to pick up an extra paper towels and toilet paper, depending on the size of your group. They are available right around the corner at a small market or at the Conad grocery store a couple of streets away.
Highly recommended for all the reasons above and more!