Just book it! This apartment has it all. Full sized kitchen, big bathroom, washing machine and a stylish contemporary decor right in the middle of town.
5 minute or less walk to the beach, 10-15minute walk to old town and around 10minute walk to the station.
There is a supermarket right opposite the apartment.
Jon is an exceptional host, giving really clear instructions of how to get to the apartment and giving fantastic recommendations for what to do in San Sebastián.
We have been travelling for 3 months and Jon is the best host we have had in all that time.