Stayed at Louise's Florence apartment for a couple of days after our Rome trip. Here's my unbiased feedback:
Location - The location was perfectly located a block away from the Firenze train station - consider this if you plan to take the train to/from other cities. It's also close to the attraction sites, shopping, and restaurant areas. Be advised it's next to front stores so could be noisy at times, but wasn't bothersome for us.
Place - Very clean and equipped. Spacious with 2 full bathrooms. It was a bit cold, esp the floor, the thermostat was disengaged. Also had some nice snacks and coffee. Comfortable bed in the bedroom and our daughter slept in the sofa bed in the living room.
Host - Accommodating, helpful and responsive.
If you plan to leave your luggage after check-out hour, there's a charge 10EUR for each extra request.
In all, was very pleased with our stay. We used the place to mostly sleep and take showers - after all, we were in Florence so we enjoyed the outdoors more.