Location: Excellent. 10min walk from Metro from/to airport, 5min from some wonderful bars (recommend Tune Inn and Hawk & Dove), restaurants (recommend Hun An Chinese) and excellent Petes Diner, 5min from a Starbucks, 10min from Capitol/Library of Congress.
TIP: Do **NOT** go to local 'Capitol Supreme' supermarket which is literally 4x more expensive than other shops.
Apartment: Excellent. Warm, very comfortable beds, well-equipped kitchen, big screen TVs, powerful shower etc.
One problem: There is no soundproofing between apartment and rental house upstairs which had seven guests, including four young children during our stay. Considerable stomping from 7am and again in evening prevented any lazy mornings or evenings in. Bring earplugs.