If you are looking for hostel lodgings this is fine. i live nearby and needed a place to stay with my cat for a while in an emergency when the power was out in my apartment; millizent said that they had very fast internet, and that the windows had screens so i could keep them open to get air circulation (most residential buildings in cdmx can get intolerably hot if you can't open multiple windows) while not letting my cat escape, so i booked the room. when i got there it turned out that only one window had a screen (which was bent and wouldn't fully close, so my cat almost did escape until i put her in her harness and attached her leash to the bed), so there was zero airflow and the temp inside what was essentially a cinder block oven was over 90F. (i actually went back to my apartment to get a thermometer to check.) the internet was also very slow and flaky, and you could also hear everything in all of the other rooms on that level (including the shared bathroom just outside this room...). i ended up having to book a room at a hotel and go there at 1am after being unable to sleep in the heat.
if you go in with eyes open (and don't have the restriction of not being able to open all of the windows if they aren't screened, which i know is pretty unique to my situation w my cat) and are fine with what is essentially a craigslist mattress in a converted storeroom, this is probably the cheapest option you'll find in la condesa, but you'll be getting what you paid for. (the roof deck did look nice, for the few minutes i was out there, but it was late and another guest's bedroom window opened directly on to the deck so i didn't want to bother them while they were sleeping and was only out there briefly.)