Jancarlo's place was very clean; did the basics well; was a convenient location for our DC base camp; and was a great value.
Easy walk to NoMa-Gallaudet Metro (0.4 miles according to Google, but doesn't feel even that far). Pleasant 1 mile walk to Capitol and Mall. Two blocks to well-stocked grocery store (Giant Foods). Three restaurants within a few blocks (we liked the artsy pizzas at Old City Market). Playgrounds at nearby Swampdoodle Dog Park (also amusing dog-watching), Wilson Elementary, and Tanner Park. REI is two blocks away. Neighborhood felt entirely safe.
Kitchen has every gizmo you might need, except (April 2022) no microwave. Coffee maker at time of writing requires Keurig cups. Washer and dryer came in handy for our six-night stay.
Front bedroom (the one with two queen beds) gets a bit of street noise; we used a white-noise app and had no problems.
Check-in was very easy and convenient (it's unit 310-A). Jancarlo was super helpful, prompt, and responsive to our questions.
Overall, we'd definitely stay there again for the location, cleanliness, and value.