Our stay at Rezas place in Bilbao was nice. It is a great city and the apartments location was perfect, as it was close to the metro, train station and city center and various sights.
The apartment got really hot during the night and leaving the window open turned out to be a problem because of the mosquitos. So maybe bring some insect spray or something. But other than that the apartment was nice, you have pretty much everything you need and Reza was very helpful.