This very nicely located apartment is great for a stay in Bilbao. You can reach it easily by public transport from the airport. And it's close to the old town, where you can eat, drink and enjoy a good walk during the evening. Next to that the host is super friendly and flexible. We had a great experience!
And when you visit Bilbao, do visit Gaztelugatxe for a nice hike and spectacular views. Take the bus to the end station in Bakio and walk for approximately 60 minutes to enjoy a great view that you will never forget :)