We are a family of 5 (2 adults, 2 teens and 1 child) and this place was perfect for us. It is VERY centrally located (10 min walk from the train station) and had all the space and amenities we needed to feel comfortable -- and the decor was very trendy and lovely. There are 3 bedrooms/2 full baths downstairs and a pair of twin beds/1 full bathroom in the loft upstairs. Note that it is five full flights of stairs up to the apartment (no lift) and another set of stairs to the loft inside the apartment, in case anybody in your group cannot handle stairs. There was a lovely book in the apartment that described all we needed to know about the apartment as well as practical suggestions for meals, grocery stores (a few steps down the block), pharmacies, etc that was really useful. We ate at several restaurants on the block that were amazing and friendly and loved the breakfast recommendation - Caffe Scudieri. The communication was quick and easy to understand.
We would definitely stay in this apartment again when back in Florence!