We stayed at José Antonio's place over Christmas and it was the perfect place in the perfect location, just a minute's walk away from Casco Viejo. Private parking was a great bonus too - José Antonio came down to meet us by the door and guided us to his parking which is hidden behind the building (check-in is in person with him and parking is €10 extra/night handed to him directly). Once we left the car, which is otherwise really difficult to park anywhere, we were able to walk everywhere, including to the Guggenheim Museum (only a 20 minute walk along the river). José Antonio was extremely helpful and welcoming: when we arrived, he gave us a few maps and recommended where to walk and what to see in Bilbao. He also left us a few things for breakfast and we could also use the kitchen if needed, and then even left us the whole place as he was off to spend Christmas with family. The room was very spacious with a comfortable bed and I also enjoyed the shower with all the little back sprays. Recommended!