This is a very nice apartment near the city centre (old town) of Bilbao, very good for exploring.
But the street where the apartment is located was not great for us. We as tourists felt uncomfortable: lots of unsavory people, cops and situations that felt unsafe. It is also very, very noisy. Day and night people are screaming in the streets, people shouting and partying in the building. So not very relaxing.
Also arriving by car is difficult, so not ideal if you're traveling by car.
So all in all, it was a mixed bag. If you don't mind the neighborhood, the is apartment is fine.