Hi all,
Just wanted to share something I learned while buying my CENACOLO VINCIANO Last Supper tickets this early morning. When you go to the official website at VIVATICKET -- http://www.vivaticket.it/index.php?nvpg[tour]&id=744 -- you need to purchase your INGRESSI entrance ticket (12 Euros) AND AUDIOGUIDE (3.5 Euros) together for the same date and time to be able to check out your online purchase.
BUT... if your visit (like mine at 9:30 am) coincides with the guided tour , you will need to add in the VISITE GUIDATE CENACOLO (tour guide) purchase INSTEAD of the AUDIOGUIDE. In my hurry to buy tickets (which I really didn't need to, considering the November offseason), I ended up buying all three of them -- ie., entrance ticket, audioguide and tour guide. For two people. Doh.
Not a big deal, since it's a very cheap; it's only 3.5 Euros per audioguide and 3.5 Euros per tour guide, so I overpaid 7 Euros -- which I'm happy to just give to the museum anyways as a small donation. Much better than some of the high-priced tours out there. Still, just some advice for those experiencing any difficulties with the official ticket website, in case this hasn't been mentioned here before... :)