Both Joe and Chelsea are great hosts! I spent a relative prolonged time at their apartment and I felt like at home. Pictures of the house were accurate, all was very clean and shower worked always properly. They also gave me advice on sightseeings to visit. Besides, communication with Joe via email was always fluently. The location is at a 5-10 minute walk to next metro station. Though quiet neighbourhood, I would not recommend walking around late at night. It's just common sense.
So all in all, nice time in DC and I would recommend Joe's 'Comfy Room'!