We had a great stay in Estefania's studio. It is very close to the beach, there are plenty of restaurants nearby and a Spar up the street. We've booked surf lessons in Cote de Basque and it was 20 minutes walking, all in all perfect location.
Check-in and check-out was simple, the studio was clean, kitchen well equipped and spot on with the description. We were focusing on reading the reviews and we've missed the fact there's no WiFi available - not a dealbreaker since we had a good data plan from mobile carrier, but keep it in mind :)