Traveling home from a holiday to Morocco on a motorcycle we wanted an apartment that was close enough to the center that we could walk but not too close that navigation and parking become a problem. The apartment met all our needs and was a 15-20 minute walk to the center of Bilbao and the parking was secure underground in the opposite building.
The apartment is compact and functional with the things you could need, there's enough beds for 4 people in 2 separate bedrooms, but we only used one of them. We only stayed one night and ate out but the kitchen was fully equipped to eat in if required.
In the morning the BIlbao Ferry Port was a 30 minute run and no problem.