I had a great stay at Idoia's place. The room was cozy and it even had a TV with Netflix, a mini fridge, drawers and armoire. Even though I was sharing the bathroom with others, I didn't have a problem using it when needed. Her home is very clean and it was easy to find things in her kitchen. I would recommend staying here as you're in walking distance from Old Town. Note: the area is hilly but that is in general the topography of Bilbao. You can find the public escalators and elevators for the steep hills.