This apartment deserves its great reviews. It is clean, spacious, well-appointed, quiet, and conveniently served by a major bus line. It also puts you within a couple of blocks of the Obama family and of Jared and Ivanka--so if nothing else you don't need to worry about security! The owners are great, too--fully available and helpful but not intrusive.
A few small caveats: the stairs down are steep (but there's a good rail). The apartment gets almost no natural light (but has very good artificial lighting). The main light switch is across the bedroom from the front door, so if you return after dark, have a flashlight or leave a light on. The closet is rather funky. There can be noise from the ceiling in the early evening, though Andres and his family are considerate and try to minimize it. I call these out to avoid surprises, not to dissuade anyone from booking. This apartment is a great value.