About 400m south of Lago de Enol, along the PRPNPE2 hiking route, you'll find the Refugio Vega de Enol, whose 16 bunks are the nearest accommodation to the lakes. It has a hot shower, serves good food, and is reachable by vehicle (signposted just before Lago del Enol). Book ahead.
Refugio Vega de Enol
Picos de Europa