Prato

I'm thinking about Prato today.  It's 20 minutes from Florence by train, and costs less than 4 euro for a round-trip ticket.  I started reading Iris Origo's book, A Merchant from Prato, again last night.  It'a a biography of sorts, and is based on Sr. Datini's documents, which were sealed up inside a wall of his palazzo, from the time of his death in the early 15th century, until some time in the 19th!  I think his palazzo is still there, and open to the public. Has anyone been to Prato recently?