TLDR: This is a fantastic unit in a very convenient spot -- I highly recommend it.
CLEANLINESS: This unit is super clean and comfy, especially considering it is a basement. During the month I stayed there, I only spotted one centipede that I think got in through the front door when I was taking out the trash. Other than that, all I experienced were fruit flies, which you can easily take care of using the classic vinegar/dish soap trick. I was very impressed with how clean the unit was, and it's easy to keep shipshape using the supplies provided. There's a shared laundry room that links to the bedroom and is equipped with detergent and dryer sheets -- excellent for longer-term stays.
CONVENIENCE: Unit is equidistant between U St. and Columbia Heights Metro stations, as well as lots of bus connections on 14th. You can easily walk to Giant, Trader Joe's and Whole Foods. It also goes without saying that this neighborhood is surrounded by lots of fun, local eateries -- all within walking distance!
AMENITIES: The kitchen is very impressive for an Airbnb. You won't be cooking a holiday feast there, but there's plenty of cookware, a gas oven, and a sizable sink with garbage disposal. There's also a well-stocked spice cabinet and lots of tupperware if you need to meal prep. Bathroom is nothing exciting but body wash, shampoo, and conditioner are provided.