The apartment (we called it a palazzo among ourselves) is fabulous. It is incredibly spacious - the photos don't do it justice. We were a group of 5 and it can easily accommodate more people. It has three separate sitting areas and would therefore be perfect for four couples or two/three families that might need separate common spaces. It has a great location and is within walking distance of the Duomo, Piazza Signoria, Santa Croce, the Uffizi, Ponte Vecchio, Santa Maria Novella and the Accadamia (which was important because my 84 mother was along for the trip).
The kitchen is well-equipped and we made use of it during our stay.
There are two bathtubs in the apartment, which is a rarity. I appreciated the thick white towels in the bathrooms - also a rarity in Italian hotels/apartments.
The host gave us a list of nearby restaurants and service providers (i.e., grocery stores), which was very helpful.
Overall a wonderful experience - I'm trying to think of a way to get back to Florence with a group so i can rent the apartment again!