This unit is located at 1731 20th Street, Northwest. The listing says:
“Live in the center of Dupont! A unique and stylish 1 bedroom apartment with hardwood floors, open kitchen, new bath, and built-in bookcases. Access to the bedroom is attained by passing through a “secret” bookcase entrance. Building is well maintainted and does not have an underlying mortgage.”
You can see more photos here.
This 1 bed/1 bath is going for $279,900 ($366 monthly fee.)