Amy's place is a great value and a great location. We were quite comfortable there with four people, and you might fit as many as six depending on the sleeping arrangements. NoMa is convenient to Capitol Hill, Georgetown Law, Gallaudet, Union Station, and other DC locales.
Amy's family lives here, so this isn't a dedicated rental. They do a fine job of moving around and putting away their personal belongings while leaving, say, closet and refrigerator space for guests.
You can fit two cars in the garage; we did it. I'd recommend that if you do this and want to use them, they be two small cars. We parked a minivan and a compact sedan and it was so tight we didn't want to move them in and out and have to go through that again. We just used Uber which, Washington parking being what it is, you just might do anyway even if you drove to DC or rented a car.
The downstairs bedroom is cool and spacious and dark. My mother in law was very comfortable there. The upstairs bedrooms were fine. The neighborhood is quiet at night. The plumbing was modern and the showers were great. We didn't cook much but the kitchen seemed to have what we needed when we needed it.
We enjoyed our stay and I'd happily return.