Oscar's place is modern, clean, and very comfortable. It is located in the old part of Bilbao where it is almost completely different from the area around the Guggenheim. You pretty much have to walk to get anywhere around central Bilbao, so even if you go to the nearest metro stop, it'll take ~12 minutes walking to get to Oscar's place. I did not get to meet Oscar himself, but he was extremely quick in responding my messages. Instead, I was greeted by his nephew Carlos, who I believe was staying in the other room but was extremely quiet that I did not even notice. These two seem to be very nice people. I would very much recommend Oscar's place to solo and couple travelers!