If the albergue is closed, head over to La Posada del Embrujo. They will help locate the keys. If they water is not turned on, they can also show you how to turn it on. No heating, and no hot water.
The Posada is also the place to go for dinner. They do an 8€ menu to dine-in or take-away and they have a vegetarian option.
These distances are exact, but are based on a straight line from point to point. Actual walking distances will be slightly longer.
The correct number is 606 104 889. The Albergue looks fine. There are 12 cosy bunk beds and the usual facilities. The Casa rural run it which is only 50m away down so steps and they will provide dinner if you give them some notice of your arrival.