Location. Location. Location. We have stayed in many neighborhoods in DC and like this H Street location the best. It is very walkable to many of the things you will want to do in DC. The Capital is a "short walk" and the White House, Lincoln Memorial, Jefferson Memorial, etc a longer walk. We walked everywhere we went and that meant 20-25K steps per day.
The flat is perfectly designed for two couples as each bedroom has its own bathroom. The kitchen is well-equipped and there is a Whole Foods literally right across the street. We loved eating breakfast at "home" before heading out for the day and even made one dinner. This can really cut the cost of the trip.
The space is very clean. The common areas are beautiful, sort of a W Hotel vibe. Nice gym. We would stay again.