My boyfriend and me stayed for one week in Josu's appartment. Josu was very welcoming and gave us a lot of good advice and recommendations so we could make the most out of our stay. The appartment is in a nice area with lots of bars and restaurants around. Especially on the weekend you will hear the people outside and the cleaning car the next morning but it didn't bother us. The nice appartment, Josu and the perfect area to spend time in were definitely the best choice for us :)
We can definitely recommend to stay here when you're in Bilbao.