We had a wonderful stay in the center of Bilbao. The location was near plenty of food and shopping options, and less than a 10 minute walk to museums and Old Town.
Villarias welcomed us and provided some guidance for things to do during our visit. The apartment was modern and the kitchen was stocked with enough cookware. The only things to be aware, the showers are quite small, and the windows are not soundproof, so you will hear people from the street.
Overall we enjoyed our stay and would happily return for a future trip to Bilbao.