I stayed in the flat with two friends and the place is amazing - great location near to Zurriola beach, a supermarket, and a great restaurant / bar (called Salt), clean and tidy inside, the rooms are spacious (you could happily fit 6 people in the flat) and every night we slept like a dream. There is a kitchen with plenty of saucepans for cooking with.
Masa met us from the bus station at the flat and showed us around. She gave us loads of helpful information; about the surf school, bike hire, taxis and places to eat.
All in all a brilliant stay and definitely 10/10! Thanks guys and hopefully see you again!