We had a great 9-day stay at Shawn's basement unit. It was clean, quiet, and secure and very convenient to the Metro subway station (5 minute walk) which we used as our primary mode of transport. Trader Joe's is a little beyond that if we needed any groceries, with Whole Foods about 10-15 minutes away.
The 1-1/2 bathrooms really came in handy in the mornings and the full kitchen also was utilized. The couch was super comfy after a long day on our feet.
We'll certainly return if we come back to Washington, DC.