We loved staying and Xabi&Almu's place where we stayed with our 3,5 year old daugther. The flat is spacious, arranged with great taste and very comfortable, it has all the necessary amenities (it even has the ones that are not necessary - like Xbox :)). It is located right in the city center but a bit away from the tourists crowds. You can reach it very easily by bus from the airport, there is a public parking and underground station nearby too. What was particularly useful were Xabi's recommendations regarding food and sightseeing. Thanks to him we went to Puerto Viejo which was the highlight of our stay in Bilbao. We would definitely recommend this place and even more its host!