We have gone on Private tours three times as there quicker, but we have seen the DCL coaches arrive about an hour after us at the Piazza del Duomo, this is the central place with the Duomo so you can't get lost, if you did, everyone knows where it is. You can't miss it.
PS Thas not the red marker but at the top the big church is the Duomo. Piazza de Capitolo.
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