Is this tour accessible for wheelchair users or guests with mobility issues?

Due to conditions inside the Duomo (463 steps and fairly narrow passageways), wheelchair users, those with limited mobility, and anyone with claustrophobia unfortunately cannot be accommodated on this tour.
Are children able to take this tour?

Due to security reasons, children under 7 years of age aren't allowed to climb to the Terraces and are therefore unable to participate in this tour. Minors between the ages of 7-17 must be accompanied by an adult to climb the Terraces.
What can I bring inside the Florence Cathedral?

Visitors to the Cathedral must use mandatory luggage storage (Piazza Duomo n. 38/r) to leave the following items before entry: suitcases, backpacks, and large or medium-sized bags.