Great apartment! Olga was our host and was fantastic and responded to all our communication very speedily. The location of the apartment was great for us to explore Bilbao and was very close to shops and 5 min walk to Old Town and ~30 min walk away from the Guggenheim. For families with strollers there is one hill with steps but it is very manageable and there are escalators for the way back up. The location was quiet at night and there are shutters to block out the light so all our kids slept very well.
The apartment was perfect for us. We were 4 adults and 3 kids and there was plenty of room. The beds and pillows were super comfortable!! The hosts supplied two travel cots for us for the babies which was very helpful.
We stayed in July and it was +30 degrees. There is no air conditioning but there is a fan and the temperature of the apartment was comfortable when the windows were opened.
We thoroughly enjoyed our stay and would recommend to anyone wanting to stay in Bilbao.