On the Buen Camino app the cooking pot symbol means that there's a kitchen available for pilgrims, the plate with knife and fork means that there's a communal dinner available (usually for an additional fee at private albergues, but as
@J Willhaus said at donativos it will be included), a coffee cup means that breakfast is available.
More information in
this PDF (in Spanish) about how to use the app.
This is what it says about possible albergue amenities:
Cada alojamiento incluye sus servicios. Todos los posibles son: lavadora, lavadero, secadora- centrifugadora, calefacción, cocina para uso del peregrino, cena, desayuno, internet wifi, taquillas, bar-restaurante, oración comunitaria, admite reserva. También informa si admite peregrinos minusválidos, ciclistas o a caballo, si se puede acampar y si admite animales de compañía.
Google English translation:
Each accommodation includes its services. All the possible are: washing machine, laundry room, dryer centrifuge, heating, kitchen pilgrim's use, dinner, breakfast, wifi internet, lockers, bar-restaurant, community prayer, Reservations accepted. Also inform if it supports disabled pilgrims, cyclists or on horseback, if you can camp and yes pets allowed company.