The position was fantastic. You have everything near the house. Enjoying Bilbao from Casco Viejo was a beautiful discover.
The apartment is a bit old, but very charming. It has everything you might need. Just be prepared that Bilbao nightlife can become a bit loud in the weekend. The owner even provided earplugs for the loud nights. Josu was very kind and polite. He, indeed, helped me with useful tips for my trip.
The cleanliness was ok, however the kitchen wasn't as clean as the rest of the house.
Would recommend Josu's stay.