We stayed here for 3 months and it worked well. Ted, who lives upstairs, is responsive and helpful without being invasive or nosy. But he was always ready to quickly help when needed.
One of the real bright spots of the apartment is the light. There are lots of big windows, all above ground, and since the unit is on the end, you have natural Iight on 3 sides.
Kitchen is well appointed with what you’d need for a long term stay. Also lots of bedding and pillows, including for futon couch in the living room. The desk and bookshelves were helpful for a long term stay on business.
Key code access was super helpful, not only for check-in but throughout our time there.
The neighborhood is relatively quiet and safe. I had been worried about the street parking, but it was never a problem (Ted provides permits as needed).
Do note that the apartment is a mile from Metro stops (either Union Station or Eastern Market). The D6 bus (just south on C street) is a good line for downtown and points beyond.
Would highly recommend Stable, a Swiss restaurant up on H Street and very close. Also check out Shopkeepers, a hidden gem of a coffee shop on 13th at Florida.