Just a heads-up: I was told it would be in the room by the scooter company when I rented one for my daughter, but on
DCL it was handled a little differently. It sounds like you are on RCL, so that might actually happen. Just note that if it is not in the room, don't panic. They had a central location on the ship where they left all the scooters. Just ask your room attendant where, or call guest services if he or she doesn't know.
My college-age daughter had zero problems navigating the ship with it. Just go slow and be smart. If you want one that works better in tight places, the main company that supplies cruise ships has one that looks closer to a wheelchair and can turn on a dime. We liked to rent that one before my daughter had her own chair because it is better for small spaces. It's something to consider. But either way, it will work great.
One thing I remind my daughter is that 99% of the world is focused on themselves and doesn't give her or anyone else more than a passing thought. Mean comments or stares can still hurt, but I say embrace it and show those people that you are living life to the fullest no matter what. We had a lot more acts of kindness than the other when cruising with her and had a fantastic time. Have a great cruise!