Tidy and bright two-bedroom apartment in a central area. Good kitchen, comfortable beds, and a nice view of the city. Water heater takes a bit of work to turn on, but after a few minutes the hot water is nice and hot (important when you're in Mexico City at 2300 metres!).
The building itself is really safe, with friendly guards keeping an eye on things 24/7. Although the apartment is on the 5th floor without an elevator, each floor is pretty short and the climb is quite bearable.
The area is extremely central, with tons of delicious street food, walking distance to three(!) metro lines, and also walkable (about 20 minutes) to the cafes, restaurants and bars of the upscale La Roma area. However, the apartment itself is clearly not in a super safe area. I did have a couple of minor incidents that made me nervous about the neighbourhood during my month-long stay, but in general it still felt like home.
Eduardo was good about fulfilling all of my special requests (for example, for extra kitchenware), although he did have some phone issues that made communication a problem sometimes. In the end, though, he provided everything I needed for my stay - Thank you, Eduardo!