If you are coming to climb then we usually say yes you will need a car, the closet crag is a 30 minute drive away. However we offer an airport pickup service and as the house always has climbers staying then people can manage to get to the crags by car sharing. You can get a bus from the airport to Benidorm every house if during the day, and a taxi to the house for a reasonable amount.
The choice for hire cars is very large and you need to shop around, they work out prices based on stock they have left so they can always differ from week to week.
Be careful of extra insurance charges and fuel etc
Here are a few that we have used in the past.