I highly recommend Carolina's place. Safe neighborhood (Shaw) and easy walk to metro. It's the front apt (facing the sidewalk) in a suite of four AirB+Bs. That said, it was very quiet. Clean and spacious. Carolina is very responsive. Bed is firm, which I loved. Bathroom was immaculate. Nice desk and seating. $129/night in mid-October seemed very reasonable. Autumn leaves were lovely.
Don't miss eating at Beau Thai or Dacha Beer Garden (outdoors all year). Skip Compass Coffee; bring your own mini coffee maker.
Watch weather report daily; it can change quickly. Bring layers of clothing. Daytime weather dropped 25 degrees in one day. Luckily, I was prepared.
I'd definitely stay here again.