I stayed at Paula's apartment with a friend for 12 days and we couldn't have chosen a better place. Everything was as described online, the place is very clean, carefully decorated and extremely well located. Just pop out and you're in right between beach and downtown.
Paula wasn't in San Sebastián herself when we arrived, but made sure a friend was there to welcome us and help us with the parking. Communication was easy and Paula answered any question we had quickly.
In a nutshell: if you travel to San Sebastián, Paula's apartment is the perfect place to stay. We loved it!