Crisol apartment was really nice, very clean, well taken care of, and very well situated in the middle of Bilbao old center. They gave us a lot of information about the city and what to do and see.
The only problem for us is that the street where the apartment is situated was extremely noisy, with people making a lot of noise until 2-3am. We don't know if it was just got unlucky and it was that there was some celebration that time of the year we visited or if this is a common thing.