We hired a car in June from Poplar.com at Dalaman airport. £150 for the week. Agent was standing outside airport with our name on card and took us to car. He then drove us 5km to office, where he did the necessary; driving license, passport, credit card stuff. We then drove to Datca, two hours of effortless driving. I would definately use them again but would ask for car with bigger engine, due to mountains between Marmaris-Datca, Datca-Knidos etc. Also Diesel might be more economical as the petrol is quire expensive.