Our stay here was mostly good! TL;DR: If you are one person renting this unit you should be good to go, if you are two people I recommend reading on for some small issues. Remember that you get what you pay for! As this was the cheapest by far out of our options, I would say it is a pretty good value but not a great one.
If you do not know this area already and are foreign to Mexico, you should definitely know that there is a lot to learn about how this area works and that main thing is that it's not a good idea to plan on walking in this neighborhood after dark too much, especially after 10 or so. Location-wise though, this IS a really interesting and cool spot to walk to countless sights and activities in the Centro Historico, just know that that comes with a cost of comfortableness in the nighttime.
I think the main things to know for others looking to stay here is that this is not someone's apartment, this is a unit clearly rented out for airbnb. This is reflected in small details about what it is like to be here and little missing things you might expect from a place someone lives. Specifically, a lack of logical places to hang towels, also a lack of a hand towels (just one really for the bathroom and none for the kitchen), and the relationship between the concierge and the owner of the apartment is a bit opaque/unknown so it's a bit awkward wondering if you ask them or the host something. That said the concierge did help us with several small issues and were largely nice and provided good assistance. Jesus also responded promptly via the airbnb app.
Maybe the worst overall thing is the comfortableness of the bed and pillows especially for two people, I recommend bringing a pillow you like for your head. Couch was also not great.
The unit was clean overall, but not exactly deep cleaned when you look closer, so that could be better. Still, when we arrived and throughout our stay, it feels like your little ikea box in the middle of a very very old neighborhood with tons of character to learn about and enjoy-- and so, the airbnb is like a break from it all, with netflix if you need to decelerate your brain.
Earplugs are a must as the walls are thin and the street outside is like a canyon, reflecting soundwaves and making them louder since there is no break in the facades of the building-- however, we only had a couple nights that disturbed our sleep at all and it is a fact just about everyone in this neighborhood goes home and stays inside after hours. If you go to bed early though it might bother you more. Several nights we slept well without earplugs; you don't have to worry about it being a party outside, this street is just far enough from the Zocalo that the main nightlife there doesn't quite reach here.
The rooftop garden is definitely a nice plus, we had a few nice times decompressing there and the laundry works fine, the concierge helped with that, so in summary if you are one adventurous person looking to explore the Centro Historico I say go for it, and if you're two just consider what you value.