This was the worst renting experience I had in my whole life. (I rented cars all over the world, at least more than 100 times).
The problem was that they charged me a extra insurance that was never mentioned before on any contract that I saw in internet. As I have a MasterCard Black Insurance, I asked that since the first contact, not to have any insurance. In all e-mail that I received and I all contacts I had with their staff, the insurance was ZERO.
After returning the car, they charged me 50% MORE in insurance that has never been agreed. I sent them more than 6 e-mails complaining but they are saying NOW that ALL foreigners need to pay it. (something never said before). They have even asked for my local track-record of driving! I send it and they approved it without saying I would have to pay more!
If you rent you them, be aware that you may pay much more than the initial price.