We spent a few days at Marcia's place after Xmas. It was our first time in Mexico City. The apartment is right in the middle of historic downtown so taxis/uber never had a problem finding the address. Marcia was always very quick to reply to before and during the trip, very flexible, etc. The apartment looked like the pictures and is in a nice building with secured entry, we always felt safe. There are plenty of things to see and do in the area, lots of restaurants nearby, etc.