I've traveled to Mexico City 5 times in the past two years, always opting to stay in the Roma Norte/Condesa/Zona Rosa/Juarez areas. This time for a change of pace I opted for the Centro Historico, and I loved it. Even though I have visited the center frequently, I never had an appreciation for how diverse and active it is.
I can't imagine that there are many places in el centro that have a view as amazing as Olivia's apartment; certainly there is none that is better located to take advantage of the all that the Centro has to offer. The apartment is incredibly spacious and filled with light. The two bedrooms and two baths offer privacy from one another. The linens and towels were great, the kitchen well-equipped.
As other's have noted, there is street noise, but the only part that was an issue for us were the whistles of the traffic police. The quality fans in the bedrooms helped provide white noise, and I slept fine. My only quibble was having to depend on the doorman to operate the elevator, especially as we kept very late hours. (Trust me, you don't want to climb those six stories at 4 am!)
Olivia was a pleasure to communicate with. I'm recommending her place to all my history, architecture,and city-loving friends.