Marcia is a great host. She's been super responsive and helped us take advantage of our short stay in Mexico City. The place is central, everything in Centro is a short walk or drive or subway away. The building has security which is convenient for checking in or out at odd hours. The place has everything you would need for a stay, including plenty of filtered drinking water. Don't forget to check out the binder of information Marcia has put together -- it covers everything from sights to see, places to eat, and things you might need to know as a first-timer in Mexico.