@fbaezer,
Good to see you, fbaezer. I love Centro Historico, and have spent many hours there. I'm familiar with the places you posted pictures of, and I really like the Opera House at night. One of my favorite places in Centro Historico is La Mascota, spending many hours listening to the music and eating.
As a matter of fact, although I'll be in Mexico City next month, I'll only be in transit on my way to Cuba. However, on January 10, on my return, I'll be staying at Riazor Hotel not far from the airport. If you have the time, it would be great to have a drink and/or meal with you. Let me know if you can make it.