We had a wonderful stay at Alberto's place in Florence! The location is incredible. When we read the listing we couldn't believe the photo of the Duomo out the window, but it really is that close! Everything in Florence is very walkable, and this apartment is centrally located close to everything. It is only half a block from the Duomo, and a 5-10 minute walk to many other nearby locations including the Accademia, San Lorenzo, the Mercato Centrale, and tons of great restaurants and shops. Everything else you want to see in the old town or Oltrarno is still within 15-30 minutes walking. Alberto was a wonderful host and spent some time when we arrived looking over a map to mark many of his favorite cafes, restaurants, wine bars, gelato shops, and the nearby grocery store. We had good communication with Alberto during our stay regarding a mid-week cleaning, some other recommendations, and he arranged an early-morning taxi to the airport for us on our day of departure.
The apartment is very comfortable and has a fully-equipped kitchen (including coffee machine, full-size fridge, stove, microwave, and an oven which we didn't use), a great bathroom with an amazing shower, a comfortable bed and sofa, a four-person table for eating right under the view of the Duomo, good wifi, and a small safe which was great for storing passports or other valuables during the trip. The apartment, building, and location is very safe. Because of the central location and the large number of tourists, it was sometimes a little loud at night, although we didn't have any trouble sleeping. (Bring earplugs if you're sensitive to this at nighttime.)
Overall we had an incredible stay and would definitely stay at Alberto's place again, and recommend it to our friends.