It's very usefull for "beginners" also, and definitely enchanting to admire the "Pianta della Catena", Chain Map, a beautiful wood panel painted in the 1470 with the frame carved as a chain - it's a photo of the city in the Renaissance time.
The lunettes of Justus Ustens, a flamish painter, describe how the opulent Medici Villas were before all the changing they have been through.It is located in the wonderful Loggia of the Oblate nuns ex-convent, in Via dell'Oriuolo 24.
Update: the museum Firenze Com'era is temporary closed, waiting to be restaured and probably moved to a different location
Plastic model of Firenze Romana
One of the lunettes by Justus Utens
I love that: the original keys of the door of the city wall!
The Chain Map - Renaissance Fiorenza