As stated on the official page of the Italian Ministry of Culture (INGRESSO GRATUITO NEI MUSEI PER I PORTATORI DI HANDICAP E I LORO ACCOMPAGNATORI - Ministero della cultura (beniculturali.it)) people with disabilities are entitled by law to free priority access to all Italian State Museums for themselves and for a companion (if it is provided in the disability certificate).
Therefore, it will be enough to go to the attraction of Firenze Musei you want to visit without prior booking, and the staff at the entrance will provide all the necessities.
The only exceptions for which the reservation is Michelangelo’s Secret Room, because the visit is organized in numbered groups at specific time slots.
The reservation does not involve any cost, as a matter of fact there are available free fares for certain categories of visitors which include people with disabilities and their companion.
It is possible to book Michelangelo’s Secret Room both online from the B-Ticket website and by contacting the call center at the number +39 055 294883, Monday to Friday from 8:30 am to 6:30 pm or Saturdays from 8:30 am to 6:00 pm.
For additional information on the accessibility of the attractions we suggest you visit the specific webpages of the one you are interested in visiting, otherwise you can 'Submit a request' to our Customer Service.