This tiny house is exactly as described. My husband and I stayed here and it was comfortable for the two of us.
Check-in was very easy. Linden sent us the door code in advance and there was no problems.
It is about a 20 minute walk to the nearest metro station (Eastern Market) or the Capitol Building. The neighborhood is very pleasant to walk in. Walking in the rain was less pleasant. I recommend bringing a proper rain jacket if you'll be here in the spring!
A minimal breakfast was provided (coffee/yogurt/breakfast bars). This was a perfect start to a day of sightseeing in DC.