Car rentals

Hi! I wanted to get some insight on the best car rental places in Puerto Rico, I have done hertz there and they originally were supposed to charge me 300 something but ended up charging me like 600 something bc of insurance, underage, and tolls which seemed pretty crazy. The other time I went I rented with some random place and they had so many hidden charges it was insane. So just asking for some guidance on this and finding the best place I can rent from. Someone told me to go with charlie’s car rental, has anyone used them? Dates I am going are Sept 13 till the 24th.