My partner and I stayed for four nights and had a really great time. Everything about the apartment is as described and, I would say, it is better in real life than in the pictures and great value.
The location is fantastic; a nice residential neighbourhood mere minutes to the Capitol and in easy reach of some great restaurants.
Alison's hospitality was also excellent with lots of clear communication and plenty of offers of advice and tips.
The only point I might add is that these houses are fairly old and with that comes an element of inevitable noise from above, which to Alison's credit, she completely recognises but also expects a similar level of courtesy from guests staying below. By no means was this an issue for us but, if you are looking for total silence for the duration of your stay, then you should probably bear it in mind.
I would very much recommend to anyone wanting to spend a few days in DC.