All the other reviews are dead on; impeccably clean, great towels and bed linens, extremely well equipped new kitchen. The flat is spacious and very comfortably furnished and well located. The nearest Metro stop is literally around the corner. The Mall, Wharf and transfer to other lines are all barely 10 minutes away by Metro.
Chris was an outstanding host, offering flexibility on checkin/out times and responding immediately to a plumbing issue. He had a new kitchen faucet installed within several hours. (I wish I could get a plumber to show up that quickly!) He was welcoming, but not at all intrusive. All in all, a great stay, and one we would repeat when in DC again.