We loved how close we were to everything and how private we could also choose to be. The spare bedroom may be a little tight for 2 adults, but the bathrooms are spacious with great showers.
The grocery store Mercado San Martin was literally down stairs. Having a parking space gave us the chance to travel in the surrounding country. San Sebastián is a gorgeous city and it was dressed at its most luminous for Christmas. Highly recommend this flat and our hosts.