Exceptional hosts! Mark and Liz are fantastic, accommodating, and here if you need them. They have crystal clear instructions and labeling (I even came with a car, so it helped when I needed to know where to park). They're also very responsive both late in the evening, and early morning, even though I never expected a reply at those times, of course. I'm not saying this to set high expectations but sharing this as a testament to their intentions and character as hosts. They certainly go out of their way to make an excellent experience for their guests, that is, beyond just a clean place to stay, which is certainly important as well and something they have exceptionally provided.
Their Airbnb lets you have your own space and get a feel for what it’s like living (not just staying over) in the city versus just staying in a hotel. Beyond that, they provide the essentials a hotel would provide (towels, Keurig coffee maker, shower, welcome basket with slippers, and snacks), plus great privacy. The ambiance, the customizable lighting (colors, brightness, patterns), and the complimentary chargers. Well-designed and maintained with a new feel, comfortable bed and furniture, personal touches to the space, and reasonably spacious. They gave me local recommendations.
For those considering booking a hotel, from my experience, you'll pay more at a hotel and get less of an authentic, welcoming, homey, clean, yet the very private and quiet experience of having your place in DC. They were very welcoming, though remotely, e.g., their responsiveness, extending my stay, their welcome tone when messaging them, to let you have your private venture. As someone who's tried both a hotel and Mark and Liz’s Airbnb, trust me. As a side note for first-time DC travelers, you can rent a scooter or take the metro and get around the city quickly from their place in DC.