We have a nice stay in Bilbao, nice apartment with 3 good slepping rooms. Living room quite small, but we were outside most of the day, so not so important.
Toilet/shower small, but fine, kitchen fine, space to sit down and eat (4 adult people).
Apartment nice and clean, but a little to cold around 18/19 degrees - we could not manege to change settings.
It is a good location, close to old part of town, in a nice a clean building. Small supermarket few hundres meter away, small cafe close to apartment also. Bilbao is a nice town, and you can easily walk around to most of the city (new+old part).
We enjoy our stay, and if we should come again, we would like to get same apartment again, but 20/21 degree inside would be nice ... it was a little to cold. Host was easy to contact via mail/airbnb.