The apartment and location of the apartment were great and communication with the hosts was quick and easy and we got some good tips for what to do in Bilbao. We didn't have functioning air conditioning though, which would have been a problem if it had been warmer but we were somewhat "lucky" arriving when the weather was not too hot. Also, the hosts brought us several fans and did their best to get the air conditioning checked (+ I think malfunctioning air conditioning was a problem for many in Bilbao during this time, since the big heat wave from the week before we arrived).
All in all, really recommend this stay in Bilbao! It's beutifully located next to a nice park, the area is calm, it's also very close to the Guggenheim and there are so many nice places to eat close by. It's also not far to the main bus station/Intermodal and walking distance everywhere (around 20 mins to the old town). :)