If you have a demanding job, choosing a restaurant for a nice meal can be overwhelming, especially when exploring a new city. To offer assistance, I've assembled a quick list for your reference:
Casual:
Contramar
PKNA (Street Food)
Mendl (Brunch)
Maque (Brunch)
The Coffee
Not-so-casual:
Azul Condesa (Lunch)
Balcon del Zocalo (Dinner)
Carmela y Sal (Dinner)
La Capital (Dinner)
Ling Ling at the Ritz (Dinner)
Madre Cafe
Merotoro
OUZERIA
Pujol
Rosetta
Saks San Angel (Brunch/Lunch)
San Angel Inn (Brunch/Lunch)
Sanborns Madero (Brunch/Lunch)