Great apartment a short walk from Casco Viejo, super market, cafes etc.; We walked everywhere in Bilbao. Which by the way, is a very nice place to visit for a few days. The apartment has everything you need: bathroom and kitchen seems all new and the living room is nice for eating and taking a nap. The only thing that bothered us a little bit, was that the floors were very cold. So if you come a little out of season, like we did, bring an extra pair of socks ;-)
Valentin was very helpful with tips about local restaurants, bars etc. Our warmest recommendations :-)