It's a fantastic place to stay in Bilbao, or as the locals amusingly call it: Bilbo. The place is spacious and very nicely decorated, not to mention top quality 'fit out'. Kitchen, bathroom and the living room are all very well equipped and it's all for your use, including netflix and spotify. The place is in a quiet street of the old town, right next to a number of bars, restaurants etc. City center spots are also just a moment away, although the square where buses from the airport arrive/leave is about 20 mins walk - so definitely not far, but be prepared with your bags and all (no Uber in Bilbao so far).
Perfect communication with the owner (Jose Maria), who was always helpful and willing to assist, were another plus.
I definitely recommend this place. Enjoy it :-)