The appartement is in a nice little building in the center of Barakaldo, this city is part of the surbubs of Bilbao, you went find there a breath taking view or many activities but very nice cafés at amazingly cheap prices for a great taste and in a welcoming atmosphere!
It's very practical to go to Bilbao and the beach by car and it seems as well metro (don't trust what google's say, there seems to be a good transportation network). There is only one free parking in Barakaldo but it's not far from the appartement at all, about 5-10mn.