The apartment is very comfortable and spacious, we were a party of 4 people and it was perfect. Beds are large (king and queen size) with very good mattresses (memory foam), also the showers were great, with hot water and good water pressure. The apartment has a very nice ambience and it is very well equipped, with good amenities (kitchen and appliances, cable TV, fast wifi). It was also very clean.
The area is also phenomenal, walking distance from many restaurants, bars and sightseeing spots. Luis and Paco are great hosts, they always promptly answered to any question we may have had before and during the trip. They were very kind to provide snacks and drinks upon our arrival.
The only thing to be careful, the apartment is on a 4th floor with no elevator, so it may be tough to climb the stairs for an elderly person or somebody with disabilities. But if you don't mind the stairs, the apartment is really perfect, and I would come back again next time I visit Mexico City.