Sorry about the delay in responding - we've been travelling.
The hotel promoted the walking tour we did but it is available through the shop in the corner of the piazza. If you are standing looking at the tower it is in the corner diagonally front left. the tours start from outside this shop as well.
Hi, sorry for the delay but I have only just returned home and didn't see your message. I am not sure what is available locally but I always use Tours by Locals. Look them up. They use local guides who are registered and knowledgeable and these guides usually have set tours or they will create one just for you. Hope that helps.
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