My wife and I had a great stay at Rafael's place. It's an airy, spacious apartment that's ideal for a couple, and its central location allows you to easily walk to Old City, Roma and Condesa (the neighborhoods that we found most interesting). It's also a five minute walk fro the Sevilla metro stop that will give you access to the city's further points.
Rafael was also a great communicator. Our flight into Mexico City was repeatedly delayed, and throughout the whole ordeal he consistently responded to our texts, and he arrived early to let us into the apartment despite our awkward arrival time. Even after check in, Rafael sent texts everyday asking about our stay and offering sightseeing and restaurant advice.
Would certainly stay here again.