The location really and truly can't be beat. Parking was a bit of a hassle, but it was just great to be so close to Dupont Circle, and in such a lovely and bustling neighborhood, within walking distance to everything. Alex was a very nice and responsive host.
The apartment itself is fine. A bit shabby, but clean enough, and spacious. The only significant problem was the bedroom air conditioner, which was very noisy. We were there during a hot and humid week, so we needed to cool the room to sleep. But every 30 minutes or so, the AC would kick on with a startling WHOMP and then rattle for about 10 minutes. Then it would go back to a low hum, until WHOMP. So if you're coming to DC during hot weather, and you value uninterrupted sleep, this might not be your spot. Otherwise, go for it.