We had a great stay at Christopher's place and I would definitely recommend it!
Pros: The apartment was very nice and well equipped with everything we needed - including tea, coffee, and oatmeal for breakfast. The king bed is extremely comfortable, like sleeping on a cloud. But it is very plush so if you need a firm bed just be aware that this one is not. The place was spotless and checking in and out was very easy. Christopher also had a parking permit for us to park on the street and we didn't have any problems finding a spot throughout our stay. There is a bus stop on the corner that runs a great route through downtown DC.
Cons: The apartment is next to a rather busy street and there is some traffic noise at night. The apartment is about a 20 minute walk from the nearest metro. Also the water pressure in the shower was very low.