MJ's place is very nice, clean & new. Everything is top of the line: Kitchen TV, beds & showers. Be aware that there is no outdoor space but you can sit at the bar up the hill & enjoy the view of the mountains. It is close to Gernica which is ~10min drive. We found it centrally located for visiting Bilbao, San Juan de Gaztelugatxeko & Zumaia . Internet is decent but nothing close to fiber speeds.
For check-in you want to drive to 6 Ibarrekozubi Bidea then take a road, that does not appear on Google Maps, left to the top of the hill where the bar her family runs is located, Bar Egala. You end up parking at the top of the hill adjacent to the bar & you may be boxed in by others cars but they will move their cars upon request. We found it easier to park on the other side in the Herriko Plaza.
Her parents are on-site & very nice. Any issues, just ask at the bar & chances are it's a family member working it :)