I'm Paris and CH-FR based but visit Spain every two years (last 18 months ago).
My interest is interesting food in mostly new places for 100-120 E a couple, including wine at lunch. Decor, nappery & flowers are unimportant.
As examples of what I've found enjoyable are the two museum restaurants in Bilbao and the places run by El Bulli graduates around Girona.
I will be staying at the Miguel Angel (Metro: GREGORIO MARAÑÓN) but willing to travel by Metro up to 40 minutes.
In gratitude I'll award you a lifetime subscription to John Talbott's Paris.