Perfectly located apartment in the nice area and street of Bilbao la Vieja, we had the entire apartment for ourselves.
Looks exactly like the pictures, slightly outdated but very cozy interior and specious place for 2 persons since you also have your own living room. We didn't use the kitchen because there are countless good restaurants and pintxos places to visit.
Eva's recommendations about pintxos places/bars/restaurants were all very nice, our favourite was Peso y Neto, which was just around the corner in the same street. Communication was good, she was very friendly and we could use a public transportation card, we could take some of the coffee cups and other equipment in the apartment and borrow a umbrella.
Minor downside, for stomach sleepers just like me, the bed was not very nice because of a pit in the middle.
Overall, if you look for a place with very good location and good value for money for a few days of Bilbao it is a recommendable place to stay!