Great flat with everything you need. It is in the suburbs so you see how real Bilbao people live (and it appears to be all in flats!!) but it is only 2 easy stops to the tourist centre so worked well for us. it was cheaper than central accomodation and didnt make any difference jumping on the metro.
We also had a car so could park it on the road for free. Note its hard to park for free after people have returned from work. However, paid parking was only a couple of euros overnight.
We were left nice treats by Sergio which was a nice surprise. We were the first guests and were very happy with our stay and all the help from Sergio.