I hired a car in Lanzarote last year, 40 EUR* for a new shape focus for 24 hours, ended up with a 2.0T Saab 93 because they couldn’t get the Focus. Got told “If you damage the car, have any problems, just give us a call and we’ll bring you a replacement one. Also, don’t fill the fuel tank up, just make sure there’s a little bit left when you return it”.
I expected the ‘if a fly craps on it, that’ll be a trillion euros’ stuff so was pleasantly surprised!
*Probably a bit pricy, but I did it last minute and only for one day, the daily rate obviously drops when you hire for longer.