Great place and very true to the photos. Despite being a studio, Armando's place is very spacious and has a large kitchen, which was great for an extended stay. It's an incredible location, and you get a nice view of the Ajusco through the windows. The bed is firm but comfortable, and the furniture in general is great quality.
Check in was super easy, and Armando was incredibly responsive. Although the location is in the historic center, which means you might witness some protests while staying here, the building felt very safe and has two guards 24 hours a day.
Some people have noted that the kitchen is well-equipped; this is certainly true. There isn't a microwave or coffee percolator (there is a pour over contraption you can use to make coffee), but in general, the kitchen is very functional for all your cooking needs.
Overall, I think this place is incredible value for the location and the quality of the apartment itself. I'll definitely keep it in mind for the future!