Stunning place....perfect location. You won't find better balconies overlooking the water in San Sebastian. Maria's place is a gem. It is the perfect location....short walk to Old Town and Gross. Maria is a wonderful host -- she is seemingly always available and will give you good recommendations, as well. The only negative to this place is Maria's neighbors can be a bit noisy at night, the walls are thin. However, Maria gives your earplugs in case you want (it isn't THAT bad).
We love her place, and when we return to San Sebastian we will certainly be staying here again. Love it. 5 stars all around.