The combination of hospitality and location are some of the best that I've experienced through many stays at Airbnbs! Graham was a gracious host and made everything easy for us throughout our stay and would definitely recommend this spot. The apt is spacious, clean, and has all the amenities you'd need/want. There's also a CVS and Whole Foods about a block away for anything you'd forget! The street noise and noise from the bar/restaurant on the corner is exactly how Graham describes it, so he manages expectations well around what it will be like.
The DC Streetcar (free!) is right across the street and gives quick access to Union Station and access to other great spots on H Street (Bullfrog Bagels is a must for breakfast! Get there early! They sell out quick. For a great cup of coffee near Graham's place, the Wydown will hit the spot. For a great bookstore experience, complete with coffee and wine/beer, Solid State Books is also nearby). The Streetcar will take you to Union Station where you can jump on the DC Circulator ($1) and make your way to the museums and monuments around the Mall. Bus access is also across the street and will get you into the heart of DC quickly for just $2. I went for a run in the mornings and within about 10-12 minutes was on the Mall with all the other DC runners!