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.