This place is absolutely stunning. The pictures of the inside are very true to the design and style of the the apartment, but the view from the balconies isn't given proper justice because it is an absolutely incredible site to see the cathedral so close.
My wife and I stayed for 5 nights at the apartment and it felt like home immediately. We developed a routine of getting coffee and pastries in the morning right outside. Doing some sight-seeing during the day and picking something to eat at the markets to eat with the big windows open to soak in the town square which is right below. And then, going with the crowds below at night for a late bite to eat and some drinks at the bars. Be aware you are literally right in the middle of the action so if that if not what you are looking for, this might not be for you - but in our opinion there could not have been a better location for us!
From the balcony, we were able to witness hundreds of the town people come together and perform a traditional dance routine (I'm told it happens once a month) to traditional Basque music. Then the next night, we watched a procession go by as all the neighbors came out from the windows of the adjacent apartments. It felt pretty special.
Additionally, we felt the value of the apartment was excellent. Ana was so easy to communicate with throughout the whole process, even graciously changing my reservation dates when my vacation plans changed a little. She met us in the apartment to give us the details of her lovely place. And also, she provided a lot of local suggestions and information - there are several good books and magazines in the apartment provided to read and decide what you would like to discover in and around Bilbao.
We will definitely return to Ana's apartment on our next trip to Bilbao.