We had a great stay (5 nights) in Carlos' appartment in Bilbao. The place is very conveniently located in the old town, all the main places of interest are within walking distance. Everything looked brand new, including first class appliances. Very, very clean. Faultless inside/outside soundproofing. Small balcony with a nice view over the town. Overall, a very cozy place for our family of four.
Carlos was also a very reactive host and provided all the information we needed. Many thanks!