Thank you, Lorenzo!
#1 Ultra secure! The building enjoys 24/7 security.
#2 Location: WOW. Walk out the door and you are surrounded by all kinds of delightful restaurants, cafes and bars. Just around the corner, there's a "miscelanea" (a tiny store) open till 11pm that sells water, soft drinks, milk, and packaged pastries (among other things), that comes in handy. This is in the heart of the city, which saves time and money if you are planning to really explore in all directions. UberEats is available everywhere, btw.
#3 Immaculate. You could eat off the floors.
#4 Nicely appointed. Dozens of unexpected and much appreciated amenities in addition to the usual fare, including a safe, an electric fan, a washer and dryer that work well inside the apartment, everything you need to cook and serve even a Thanksgiving dinner. Plenty of hangars. Extra towels. Dozens of magazines and travel books. Very thoughtfully put together.
Wifi did cut out now and then, but that's a common problem in Mexico City. Just be aware that you may be surfing with a looming international roaming fee at times.
We purchased a local sim card for our unlocked cell phone and then recharged it at any 7/11 as needed. This worked out great.