Although my stay in Bilbao was a very short one it still managed to turn out wonderful. And that is to a considerable extent thanks to Edurne's incredible hospitality. Everything was just as great as the previous reviews implied. When I got there she wasn't home, but her sons gave me a warm welcome. Unfortunately I couldn't go on that guided Bilbao tour with her son Andoni but I'll catch up on that. The apartment isn't exactly in the city center but that doesn't matter at all as there is a metro station right around the corner that brings you to the old part of town in no time. And there's busses too.
So, obviously, this is a recommendation!