My partner and I really enjoyed our 4-night stay at Ana and Ainoha's apartment.
The hosts are great, friendly, easy-to-communicate-with, flexible. We had planned a late arrival due a late flight, which was further delayed... but they were both very accommodating and welcomed us warmly in spite of the late/very early hour! They were also very responsive whenever we had a question, before or during the stay.
The bed is super comfortable, and the bedroom very quiet. We appreciated the space they put at our disposable for our clothes and other things. In the bathroom, the water is hot and the pressure nice. The kitchen works well, and I was happy that they had soy milk for the breakfast. And it was all very clean!
The apartment is ideally located, a very short walk from the train station to discover the surrounding towns, or to quickly go to Bilbao, but also on the lovely walking path of the valley.