Richard's place is really good. It's close to grocery store (just 10mins walk). And it's just 20mins drive to Union Station in busy hours. Richard was really nice to me and my friend. At arrival, he helped moving our luggage upstairs, and did a brief intro for the apt. He also sticked an outline for his apt guidelines and suggestions for food nearby. He responded quickly (and sorry to text him at 11:30pm, didn't expect his reply in couple mins)
It is easy to lock the door while checking out, and don't have to disturb him at 8am.
I strongly recommend those visiting D.C. stay in Richard's place. =)