Marco is probably the best host I've had through Airbnb, and I've had plenty of great ones. He goes through everything to make sure you feel welcome and have a good landscape of the city. He gives you a load of recommendations, and all of the ones I tried were fantastic. The location is perfect if you'd like to avoid staying in the the super touristy area but close enough for convenient access.
Make sure and stop by his family's restaurant directly across the street. They treat you like family and the food is wonderful. I had the lasagna, eggplant parmesan, and roasted chicken. Can't go wrong with any of them. The pizza and gelato shops he recommends are must stops as well. Probably the best of each I've had anywhere. Florence was a great visit made even better by staying at Marco's. Grazie Mille Marco!