Never use this app!!!
At the airport, the rental car counter was closed and the phone number left there (maybe the number of the manager) told me that the car had problem so he announced the rental car online site for the cancellation. After a month, I never got refund, and Carla customer service just told me that I wasn't there (No Show) so it's the cancellation made by me. I sent them the history of me making phone call to the manager and also the recipt (showing time and full route of my taxi journey) but they never gave me a refund. Never use this app in order not to loose your money and ruin your vacation.