Had a really great stay! Anything you could have forgotten about (toiletries for instance) were provided, place was really clean etc. John-Michael was extremely friendly (shame I didn’t really had much time to chat to him though).
More concrete info:
Check-in was extremely flexible (I got in at 1am just using the code he shared), the location is really quite and safe.
National mall was relatively close. I’m a walker, so it took me around 45mins walking to reach the Capitol building.
Flew to Dulles, was extremely simple to get to the place (SV line + walking).
All in all: really really worth the money, would happily stay again!