All the positive reviews you'll read are 100% accurate. Joel is a great host who does everything in his power to make sure your stay is as comfortable and easy as possible. What I liked most is how attentive he was. He wasn't there to greet me in person when I arrived, but came to say hello as soon as he came back to town and he regularly would message me to check-in and make sure everything was going smoothly.
As for the apartment, it's quaint, tidy, has all the amenities you'll need, and it is in an A+ location. When I come to DC again prior to my move, I'll be sure to request Joel's place again.