Stayed here with 4 others, and thoroughly enjoyed it. Apartment was squeaky clean, very trendy and modern. Location was exceptional- only a few minutes from the San Lorenzo market, and less than 10 minutes to the big plaza where the Duomo is located. EVERYTHING in the city is walkable from the apartment, we never took any form of public transit (or taxi) our whole stay. Also only a ~5 minute walk to the Santa Maria Train Station.
One thing to consider before booking- Lorenzo uses Keesy, which is an application/service in which we have to go to a physical Keesy location to check in and check out. Upon arrival in Florence (via train), my family had to walk with all our bags to the keesy station (~5 minute walk from the train station), then another 10 minute walk (again with all our luggage) from the Keesy station to the apartment. In the big picture this wasn't a big deal, but slightly frustrating for some of my family members that were older. Also, If you are arriving to florence another way (other than Santa Maria station), it could be a little frustrating having to take some form of transit to the keesy station then continue to the apartment.
Despite my long winded comments regarding the Keesy check in, I still want to be clear that the apartment was fantastic, and Lorenzo was a very kind and a great host!!