We are renting a private home in Umbria and plan to visit Florence several times during our visit. We would like to purchase tickets to museums in advance of our visit but do not have access to a printer. I expect to receive a voucher via email to confirm purchase. Will museums (Uffizi, Galleria dell'Accademia) accept viewing the voucher on my cell phone to confirm prepaid tickets? If not, where would I be able print out voucher? Thank you!