Great stay in San Sebastián! Apartment in great location for beach and town with lots of cafés restaurants supermarkets nearby. Stayed as a family of four two boys (13/11). It was a bank holiday when we were there and a week long music good art festival so very, very busy and prices inflated. We did not know about this and would have avoided visiting then had we known. There was also a fireworks competition which was great for one night but it was every night all week so very noisy and so sleep not great.
Natalia communicated quickly and was super helpful. Highly recommend on a quieter week!