When I think of "cozy" this spot checks off all the boxes!
First and foremost it's not far from the Union Station, a really lucky find on my part.
The hosts are friendly but not overbearing like some can be. The space is very well thought out and accommodating, anything that you'd need you'll find. The hosts went out of their way with so many small touches from socks, to guest log-ins on their streaming accounts and even QR codes to show how the coffee machine works; attention to little details like that certainly put this place above a lot of others I've stayed at and makes it feel homey.
I could honestly go on but this is a wonderful spot for a relaxing stay and will be on my list of places to lookout for whenever I return to D.C.