The minimum age requirement to rent a car in San Sebastian is usually 21 years old. However, some car rental companies may require drivers to be 25 years old or older. It is best to check with the specific car rental company for their age requirements.

Most car rental companies in San Sebastian require a credit card for renting a car. This is because the credit card is often used as a guarantee for any potential damages or additional charges that may occur during the rental period. If you do not have a credit card, it is recommended to contact the car rental company directly to inquire about alternative payment options.

To rent a car in San Sebastian, you will typically need the following documents:

• A valid driver's license from your home country
• A passport or another form of identification
• A credit card in the name of the primary driver for the security deposit

It is important to check with the specific car rental company for their document requirements as they may vary.

Basic insurance coverage is usually included in the car rental price in San Sebastian. This typically includes third-party liability coverage. However, it is important to note that there is usually an excess or deductible amount that the renter is responsible for in case of damage or theft of the vehicle. It is recommended to consider purchasing additional insurance coverage to reduce or eliminate this excess amount.

While it is possible to find car rental companies in San Sebastian without a reservation, it is highly recommended to make a reservation in advance. This ensures that you will have a car available upon your arrival and it may also help you secure better rates. Additionally, during peak travel seasons or special events, rental cars can become scarce, so having a reservation guarantees your rental.

Yes, it is possible to rent a car in San Sebastian and return it at a different location. This is known as a one-way rental. However, keep in mind that most car rental companies charge an additional fee for one-way rentals. It is advisable to check with the specific car rental company for their policies and any additional charges associated with returning the car to a different location.

In case of an accident or breakdown with the rental car in San Sebastian, it is important to follow these steps:

1. Ensure your safety and the safety of others involved.
2. Contact the car rental company immediately and inform them about the situation.
3. Follow the instructions provided by the car rental company regarding the next steps, which may include contacting the local authorities, arranging for a substitute vehicle, or seeking repairs.
4. Take photos and gather any necessary information from the other party involved in case of an accident.
5. Report the incident to the police if required.

It is recommended to familiarize yourself with the car rental company's specific policies and procedures regarding accidents and breakdowns before starting your trip.