Luisa's place is great. The location is awesome. You are right in the middle of the city and you can walk to many of the sites you might want to see in Bilbao including the Guggenheim, the Art Museum, the parks, all of the walking bridges along the river, and a bunch of great dining options.
The wifi works well. The space is perfectly clean and cozy. It's a great value. Enjoy Bilbao!