Jaime and his family are terrific hosts. Their response is nearly immediate, whether via email or in person. We had a slight problem with a toilet handle; Jaime's father came over within 15 minutes.
The check in and checkout processes were seamless.
The location is within walking distance of a wide range of restaurants and a couple of supermarkets.
The apartment looks just like the pictures. It is clean and well maintained. The building is safe and the area lends itself to a nice walk. It is centric to many districts (walking or cab).
I strongly recommend this apartment. It made for a terrific experience in Mexico City.