I relatively enjoyed Gustavo's apartment. Check in was easy enough and convenient if you are arriving late. The apartment itself is very nice (located up 4 flights of stairs for reference), spacious, and ideal for a solo traveler/couple. Has TV with cable which is a nice touch and the wi-fi is good. The location is great because you are literally outside Metro Eje Central, and there is pretty much everything you would need (stores, bars, pharmacy/laundry, etc) around you.
My one major grievance, which is out of control of Gustavo's hands, are his neighbors. Though the apartment is modern, the building itself is older and sounds travel through the walls. The neighbors can be loud at times and when I was there, someone had a rooster that would sing late at night. It didn't last for long, but it was noticeable since it was late at night.
All in all, it is a great deal because of the location and amenities. Maybe not so much if you are a light sleeper.