I stayed at Christian's apt for a week. The location is great. Not a tourist area, so you get a sense of real Mexico City. If you want fancier places-Roma Norte is a short ride on the M1 bus (right around the corner), or a 20 min walk. I used public transport to get around the city and location was great for that.
The apt is very clean. It is not noisy, but you can hear some city sounds-very manageable for this light sleeper.
There is a coffee maker in the apt, but I couldn't find the pods that it uses, so be prepared to find another way to make coffee. There's no good reading light in either bedroom, so. headlamp could be helpful if you like to read in bed.
The 2 guards who are on duty 24/7 are very nice. They help the place feel safe, show your appreciation and give them a tip at the end of your stay!
Speaking of safety, I felt very safe going out at night around the apt as it is a very populated area.