We do recommend a car or cars when staying at our house so that you have the freedom to go out and about, food shop etc, but if you only wish to hire a car for part of your stay then it is possible to hire a taxi for your airport pick up, to travel into Girona etc.
We recommend Taxi Carreras based at Vilobi d'Onyar and Girona Airport - www.taxigironaairport.com 0034 616 483 948. Josep speaks English. We are happy to book a taxi for you, please just ask.
(A rough guide to taxi prices - 20 to 25 euros to Girona Airport. 25 to 35 euros into Girona.)