Brian was super communicative and we are grateful that he permitted us to modify our reservation at the last minute (I had booked too many nights based on some bad intel).
The location is truly amazing and the apartment was clean upon arrival. We loved walking our dog out the door past the Supreme Court and Library of Congress buildings across the street to the Capitol grounds just a block away.
That said, this is more of a studio in terms of size than it is a one-bedroom, and the bed (which is 3.5 feet tall, so you have to literally climb into it) is squeezed into a separate "room" that's really just a corner of the apartment that's been separated by a wall addition. The bed is comfortable, though. The apartment was also well stocked with basics (TP, PT, towels, etc.) but something missing was hand soap.
Beyond the apartment itself, which is cozy if outdated (not sure how old that couch is and the thermostat is mostly just for show), the hallways of the building gave us a moment of pause because they are truly ancient, neglected carpeting. This isn't the apartment owner's purview per se, but just an FYI for the neat freaks out there.
Given the upsides of location, cleanliness of the apartment, etc, we found it easy enough to look past any flaws and enjoy our time here.