I have lived in Mario's place for 2 months, and it was really nice. His place is at a perfect location in the city, everything is close to it. The apartment is big and you have a lot of space. If you are visiting Bilbao, by choosing Mario's place you would not regret it. He is also a super nice host and gives you a lot of tips about what to see and visit while you are there. For me, it was a really nice experience.