Flavia and Mauricio's apartment was as described. The place was very safe as there's a doorman available always, and it is located right in the middle of the historic center. The hosts were available to answer my many questions and allowed me to check in earlier than the check in time. The only thing to note is that the city center is a downtown spot and there's a lot of people doing business early in the morning and late at night, so you'll hear them from the apartment. A pair of earplugs might be necessary if you need more quiet. Overall great value for my stay in Mexico City.