We stayed with Crystal when we visited DC. The place is very nicely situated near the Capitol. There are bikes that you can rent at the corner so you can go everywhere in the center. It's an ideal place for a city trip to explore the city. Easy to get to public transportation and plenty of Ubers.
The place is nice and fits perfectly for a family of four. Crystal was very responsive when we had questions and it was nice to meet the owners, that makes the b&b experience even better.
Would consider going there again.