I highly recommend this apartment. Javier is very attentive and responsive and friendly. He communicates very effectively. The rest of the staff is lovely (Carmen, the cleaning lady is very sweet, chatty, and friendly).
The highlight of the apartment is the location and the amenities. The apartment is located right next to La Alameda park (I went running a few times around there; there are not that many better options for running unfortunately nearby), which hosts the Palacio de Bellas Artes. If you're unfamiliar with Mexico City, this recently revamped park is lovely, and will give you a very authentic glimpse of public life at the heart of downtown Mexico City (Centro Histórico). The amount of food and culture that you can find around here is unprecedented. Plenty of amazing museums and historical sites are walking distance.
Let me highlight the food options: To taste homestyle Mexican cuisine, simply walk out of the building and within a block you will find dozens of cheap ($60-$80 MXN) and delicious options that will make you rethink about the burritos you eat in your hometown. There's an abundance of mom and pop cafes and truly artisan (not run by hipsters) shops (e.g. milk skin muffins) that sell delicious and cheap treats. Centro Histórico is also where you can find upscale yet historic and very affordable restaurants (look for food options in Bares or Cantinas) with a strong Spanish influence that sell succulent roast goat or pig leg dishes. Mexico City is not immune to hipster culture so you can easily find a yummy avo toast in one of the new chic cafes nearby. Public transportation is readily available (metro and metrobús a few blocks away). If you want to go partying, maybe you should go to Condesa, but I'm not looking to go clubbing, etc. this area is perfect for me. Even if you want to go partying, everything is very accessible through public transportation.
If you're working remotely, this place is very comfortable and ideal. Despite being right next to a lot of tourist attractions, there is no noise. The internet speed is almost comparable to the one I have at home in San Diego (I have only had a few very minor hiccups with very short freezing of my camera in Zoom) and I run Zoom meetings several hours in a row every day. There's a very comprehensive gym in the building which leads to a terrace where you can sun tan or workout. The only complaint I have for you in terms of the workout facilities is that the pool is very promising (three or four lanes, semi-Olympic), but the temperature is ridiculously high, so there's no way you can have a high-intensity workout there if you are used to swimming. However, I see people using it to relax and to teach their kids to swim.
Finally, an important caveat to notice is that this apartment is in the 14th floor. This is not a problem in my opinion, but the algorithm of the elevator is very punitive to the top floors: it picks people up in descending order. So say, if at a given time interval, there are people calling the elevator in floors 5, 7, and 14, the elevator will first go to 5 and down, then 7 and down, and finally 14 and down. This leads to an amusing probability problem (related to the theory of Poisson processes, maybe some of you reading this review will find this as amusing as I do) and has inspired me to assign it as a homework for my statistical mechanics course, but it is certainly annoying in the sense that during peak hours, say 6 pm, the probability that the elevator will arrive at floor 14 is exponentially small. So during those situations, I simply stop complaining, and spend 3-4 min to walk down the stairs instead. Outside peak hours, I have had better luck and the elevator has done its job. I would say that this shouldn't detract you from booking this apartment, unless you're kinda lazy or you really can't walk the stairs.
So overall, this apartment deserves 5 stars for price and value.