The villa is stunning and was more than enough space for 11 of us. The amenities are fantastic (good quality cooking equipment, glasses, etc.) and Maria was very proactive with any requests we had and even got in touch to tell us about things which were happening in Bilbao that weekend.
It is a short way out of town: a ten minute walk to the funicular, which is then a short 3 min trip every 15 mins. A taxi home after the funicular closes (around 22:00) is less than €15. On balance we were very glad we stayed here rather than a city centre hotel. The surroundings and outside space are also very nice. I would only avoid if you had walking difficulties as there is a steep hill in/out to the road if you do not have a car.