Location, location, location.
Carlton's place is very close to the Columbia Heights Metro (green line). Plenty of stores close by to pick up what you might have left at home (or groceries). No need for a car.
We were very pleasantly surprised that there were several restaurants (with gf options) literally steps from the apartment.
We appreciated the Apple TV option in the evenings after a day of sightseeing/walking.
It is a basement apartment, so there will be a few sounds from upstairs. That's to be expected.
Would definitely stay again.