Something else I've come to realise.
Please anyone using it, it's your own responsibility, I'm not advising nor endorsing, just telling some stories that happened to me.
I came after a week renting through this app to return my car.
I wanted to rent again a car, but there were non.
The rep advised me to extend my current rental.
I asked what it would cost.
The rep told me a rate for yet another week which was lower than I actually paid (probably the nett price, before earning on me).
So I said ok, go ahead.
When I returned yet one week later the car, and I ask how much I owe, I was told 'zero' as its a prepaid rate.
Basically I was able to several times multiply the duration of the rental free of charge.