Great location! You are literally a short drive or nice walk from all things DC. We were within a 10 minute drive from everywhere we went, including the Amtrak station.
A friend and I stayed for a long weekend in July for a girls' trip. We felt the price and location was great. Check-in and check-out were both easy and efficient. This is a "basement" apartment so combining that with the DC humidity made it a bit stuffy, but it was bearable overall.
We didn't need to contact Richard during the stay. The guest handbook he left was informative and also included nearby restaurants and places to see.
The one thing I would definitely say that you should know before you book is that the bathroom is extremely small. If you are tall or plus-size it may not be the best place for you. I am 5'2" and I felt cramped in the bathroom, especially the shower. It was still manageable, but definitely something to consider.