Nothing I didn't like.
It would be nice to have a kettle and some cups in the room.
Also be nice to have a printer downstairs so as people who are flying can print out their airline boarding cards
This is not just a review of Don Claudio but also a guide to Bilbao:
Directions to Don Claudio
Get a3247 Bizkaibus bus from airport to last stop which is Termibus (i.e. Bus terminal) at San Memes. It takes about 30/40 minutes and costs €1.40 In San Memes, go downstairs (only few 100yds from where bus came in) and you'll find both Renfe Cercenias (train line) and Metro Bilbao.
Don Claudio is in Zorrotza on the train line, not the Metro line. I got a mulit-journey credirenfe ticket for €15- (you can get it for €5- or €10-) from the touchscreen ticket machine (the machine takes notes). (You could get a single ticket if you prefer, but travelling in zone 1 costs €1.75 by ticket or €1.06 using credirenfe card, so you save money using credirenfe and I knew I was going to be using the train line for multiple journeys).
After validating your card, take the C1 towards Santurzi or C2 towards Muskiz to Zorrotza (only 2 stops). I was a bit confuse initially until I figured out that the C1 and C2 routes use the same line from 'Bilbao Abando' to Barakaldo, before they split to respective destinations. Also note San Memes is underground but goes overground as it heads towards Zorrotza.
Exit train @ Zorrotza and cross a small street and continue until you hit a main street (called Fray Juan Juan Kalea). This walk is only a few hundred yards. At this T-junction, look to your right and you'll see a church across the road. So go right towards the church, but don't cross the road. At the crossroads, turn right again. This is Calle de Hermogenes Rojo and Don Claudio is no.10. It has 2 entrances, so when you find the 10 over the door, the entry is actually next door and has Don Claudio on the door.
Staff member when I arrived didn't have any English and I've very little Spanish, but we communicated enough to get by.