Mark and Christina’s place is everything described. Clean little basement apartment with everything you need for a stay. The kitchen was a great bonus, and so was the washer and dryer.
There was some noise from above, but not distracting or irritating at all. The bed was comfy and the bathroom was perfect size for my spouse and I. Center of DC is about a 20 minute drive, but you can also take the metro.
The only few complaints I have are of the check in process- the door lock got jammed a couple times, so it was difficult to get in and out. The air conditioner was a bit far from the bed area, so it would get hot during sleep.
Overall, I would highly recommend Mark and Christina’s place!