Realizing that I never reported back to this thread, even though I did write a trip report. Just want to say that
Style Walk MX was fantastic to work with and I highly recommend them for a private tour. They also offer group tours that you can join, which I imagine would also be very good, but we enjoyed the private tour very much.
You can check out my full trip report here:
Mexico City (DL F, Airbnb, Stylewalk tours, new Amex Centurion Lounge @ MEX)