Mariana's place is great. It's clean and spacious and has all of the items necessary to make it feel like a home away from home (kitchen supplies, speakers, extra blankets). I had the very unfortunate experience of becoming very ill for most of my trip and Mariana's place provided a comfortable place to rest (it is also near to the pharmacy and local convenience stores). As this was my second times in CDMX, I chose Mariana's spot because of its central location and also it's stylish design.
A few things to note though. The building is quite old and not kept up well. For me this was relatively easy to overlook, but for others it may not be. Many residents also forget to close the door downstairs on the street. Additionally, the neighbor next door has three very loud, unruly dogs who would often stay outside on the balcony and at times it was a bit much. Regarding other comments on the shower, I would also reiterate that there is a weird sewer smell coming from the bathroom (which likely has to do with the building and not the apartment) and the water does not get very hot. For those concerned with quiet, I would also say that the street below can become quite loud on weekend nights, but it is a city after all.
I would, however, recommend this apartment, as it is well located, very clean, beautifully designed, and Mariana's friend Juan (who helps in her absence) is a very responsive and helpful.