We had a lovely time at Marta's and Miguel's place. They gave us a very warm welcome, had lots of information about the Basque country at the appartment, and even helped out with some milk. They also put two cot beds and a high chair for our little ones in the flat.

The flat itself was clean and has a modern decor and everything you need including lots of pots and pans. It's spacious and was more than big enough for the four of us. The only thing to note is that it is below ground level so does not let much light in (two bedrooms do not have daylight) and is facing an underpass off a busy road.

Zumaia itself is a nice little beach town with a few basic bars/places to eat, and two excellent beaches. One is 10 mins walking distance, the other one 20 mins. Both have a bar/cafe and are fantastic beaches. From Zumaia we took the local train to San Sebastian (1hr) and to Bilbao (2hrs) and to another beach in Zaraus (15 mins). There are parking spaces behind the house.
For surfers, both Zumaia and particularly Zaraus are great choices (although we were out of luck with waves during out stay except for a couple of days).

We will definitely come back to the area and can recommend staying at Marta's place, it's really good value for money and they are lovely hosts.