The other recent reviews are accurate. It is a good stay and a quiet room. The washer and dryer work well. The toaster oven is from the 1970s, but hey, it works. The water purifier is very nice to have. I stayed 5 weeks and would stay again.
A few things:
There is only one fan, which might be a problem if there are more people, or you want a fan in the bedroom and the living room.
As seems normal for Mexico City, there are no bug screens on the windows, so if you leave the windows open at night then mosquitoes will come.
You absolutely need a key to get out of the building, which also means that you need to schedule a checkout time so that you can return the keys and then be let out of the building. It is physically impossible to just leave the keys in the room and leave.
The *street* is quiet, especially at night. There is sometimes a party in the building on Friday or Saturday night, to around midnight, or sounds of some machine running.
The room is on the 3rd floor, counting from 'ground'. The elevator works fine, but I often just took the stairs.