We had previously used this company when it was Advantage Car Rental where they wanted to pre-authorise my credit card 1500euro for a car that was barely worth that, we ended up having to take their additional insurance premium at nearly 100 euros to avoid that. The car was a wreck.
I then was charged 38 euros in January for a traffic violation they had to provide information on, which they then wrote to me about in May. I still have no notification from the police about this.
I was very perturbed for this holiday having booked through a different broker to find that in fact Firefly was the same company, clearly having had to change the name due to adverse publicity. Their practices have not changed, nor have the quality of their vehicles. Bald tyres, empty washer bottles, dents and scratches all over the car and dirty inside. The staff are rude and attempt to be quite intimidatory if you do not do exactly what they want ie pay out additional premiums and hand over your credit card for whatever they choose to fraudulently add to it months after the event.
Oh and by the way, you can't withdraw consent with your credit card company and even cancelling your card doesnt help as you have already consented to them taking from it. I'm on the look out now for additional billing coming through on my card!!