Lorenzo's apartment is well-situated near the center, the main sights are all easily accessed by foot within 10-20min. The apartment was tidy and neat, the check-in uncomplicated, the communication very easy, and the view from the balcony is simply mesmerizing!! (you can have a drink on the balcony while looking at Florence's roofs including the Duomo - an absolute must-see!)
We were six friends staying in the apartment and think that there is enough space for so many people. There's two rooms with a double bed each and a big couch in the living room which was totally comfortable (so no worries here) :)
We would absolutely stay in Lorenzo's apartment again!