The apartment is a decent, simple space, in a great location. If you spend time in the neighborhood you will appreciate the proximity to great restaurants and ability to walk to many key attractions. Mariela was a great communicator and met me in person to check in, which helped me feel welcome and comfortable as I settled into a new city.
If you are sensitive to noise or a light sleeper, this may not be the place for you to stay: one neighbor has a parrot which was a cacophony in the mornings (I actually found it endearing) and there are other units in the building where people play music and talk loudly. Mexico City is a big, crowded place, so I think that this is part of the experience of dense urban living.