Pros:
The location is excellent, with an easy walk to the Uffizi, Pitti palace and most major sites. For someone who hasn't been to Florence before, the maps are misleading and places look much further than they really are. Even the Academia which looks very far on a map is walkable.
The apartment is large and very nicely laid out with excellent modern furnishings and bathrooms. Very comfortable stay. WiFi worked perfectly.
The main advantage for a family are the two bathrooms and the ability to wash and dry clothes. Kitchen is certainly a major advantage but we did not use it much. But everything that would be needed is provided, including coffee, tea, etc., and a nice welcome basket with fruits and wine.
Supermarket is nearby, suggest buying snacks, water and sodas from there.
We forgot to bring our travel guides, but the host has several books and maps which were handy.

Cons:
Road noise is an issue at night but that's to be expected since this is extremely close to the main tourist areas
The combination washer and dryer is small and takes longer than typical units in USA.

Bottom line: Strongly recommend this apartment for anyone traveling as a family and would certainly use this again if I return to Florence