So Marta's place is quite beautiful. Very high ceilings (~4m), lots of space, well-stocked kitchen and overall super cool. And the location is great: right in the heart of the Casco Viejo. Our balconies looked out over an intersection where it was fun to watch the pedestrians go by. And the apartment is just a couple of doors down from a great bakery (their jam-topped muffins are highly recommended). Since you are in the Casco Viejo there is no immediate parking, but very close by (~5 mins by foot) is Arenal Parking where you can pay for a 3 day or 7 day parking pass with unlimited in/out privileges. But the best thing about the apartment was Marta who was very helpful and welcoming (she met us at 12:30am as we had some issues upon arrival at Bilbao airport). She gave us lots of tips and recommendations for Bilbao and the surrounding areas....and even gifted us with some food and wine...we would gladly go back to both Bilbao and Marta's place.