This place has everything that you can need for your stay in Bilbao.
It's very clean with all facilities you would need for a short to a mid-long stay.
City center is just 10 minutes as is Public transport (Subway), the central bus station is 4 stations with the subway, but you will get anywhere important within 15 minutes as well (Guggenheim) from here.
I do recommend this stay, I was very satisfied with the accommodation.
P.S. G**gle Maps is wrongly adjusted - October 2022 (G**gle's fault) the actual house is 30 meters of (further up the hill), the host will tell you exactly how to get to the place.
I do recommend to contact them once close to the place.