@plragde
I left you a note about one great place just a 2-minute walk from your hotel on your other thread.  I think you didn’t see it?
It’s La Guisandera de Piñera at Rosario Pino.
Quinqué, yes, is in Chamartín, NOT Salamanca, my mistake.  Too late to edit!
It would be a 13-minute walk from the Meliá Castilla, on the other side of the Castellana Boulevard.
We had a lovely lunch there with another HO couple, and it´s well worth the walk!
The snails were in season and were fantastic.  It’s moderately priced and service, very attentive.  It flies under the radar but quite recommendable.
