No flexibility whatsoever! I have booked with them 2 times and have been disappointed both the times! First time, my flight plans changed by 3 hours and they defaulted my payment anyway. This time I booked an economy car (which said similar to Kia Picante). I even I got a reminder on email 2 days before the due date on the same...with no mention of automatic or manual transmission. I reach the destination (outside US) and sure enough they hand me over a car with stick gears! I void the whole reservation and try to find where I can reach out to rentalcars.com...there is no phone number available anywhere! They are some UK based company and has only the VAT number in their contact info...How helpful is that!
2 days later, I was able to locate the phone number and customer service person bluntly tells me that my "voucher" had manual transmission (I have no idea what that means!) and they will not refund anything.
Never gonna go with them again!