Overall we had a very positive experience here. The host met us in the apartment upon our arrival, gave us a brief tour, and provided us with a map of the city. He also told us to contact him if we have any questions about Mexico City and how to get around or where to go. We took him up on his offer and he always responded quickly.
The apartment was exactly as pictured, with two bedrooms and bathrooms. It was a quick walk to the metro, a well-lit park, a supermarket, and a few restaurants. It's not downtown but it's very easy to get there. I'd recommend staying.