Very pleasant stay. I was in Bilbao for work, and the location was perfect for that. Very close to the University, and only minutes away from Guggenheim, which made it very convenient. Not to close to the shopping street, so not too flustered or busy, yet stil central.
The room was very nice, however my room was in the second floor, facing the street, so there was some noice which could be bothering if one is sensitive to sounds. Also, people from the busilding across the street could easily see into my room, but the window had shades, which worked fine.
The breakfast did not have the largest selection, but the food was high quality. It was also possible to order eggs and others from the kitchen.
All in all a great stay! A bit pricy tho, so if you are on a budget, there are probably cheeper alternatives that would be just as great, however compromising on the location.