We have a place in Calis and tried a lot of car rentals until we found Fethiye Lovers, who in our opinion are the best, and we would now not consider using anyone else. The have good new cars and not old bangers that break down, they also supply cars with a bit of power. They speak excellent English and are always extremely courteous and very punctual. Last time they even let us have a bigger car for a oouple of days when my daugther and family where over, at no extra charge.
Also, a point to remember is most hire car companies will give you a car with no fuel in it, the gauge will be on empty and you must fill up immediately. Fethiye Lovers are members of this Forum if you book through Sunnyd you will get a discount.