The apartment is very well located - right next to a Metro, and a pleasant straight line if you want to walk to downtown DC. It's a good, cheap stay. I didn't meet John, but he left me keys and arranged for me to arrive even though I got to DC quite late in the evening.
The room and facilities are very, very small. I was forewarned of this and it was totally fine (I'm not picky at all about where I stay) but if you like to spread out a bit in the bedroom and bathroom, this isn't the place for you. But if you want a convenient, cheap and cozy stay, this is a great option.