My company rented this house for us to stay in while working a convention. We thoroughly enjoyed our stay.
The house is located in a trendy section of DC with tons of restaurants, bars, and stores within walking distance. This came in handy on our walks to and from the hotel that the convention was in (less than a mile away).
The house is an older row home, but it is kept up nicely. Big rooms, big bathroom! We all slept well and we had lots of space for our group. Nothing felt dated and the wifi worked well (which is important for us).
I highly recommend staying at this house whenever you're in DC. Allen does it right.