If you want to learn how to become a great public speaker and personable with groups of people its an amazing place to work. Also everyone I ever interacted with there was a delight to work with.
Svantaggi
The only con would be the amount of time it takes to learn the tours to memory and the fact that you are not paid for that learning and in general you will not receive a lot of hours as it is a part time night job. That being said if you are looking for a fun job for after work and enjoy history or haunted stories its really a great environment.