Our family of four very much enjoyed our visit and the accommodations. Freddie gets 5 stars for his attentiveness and eagerness to accommodate. Heavy rains the first night caused a minor leak in the upstairs skylight which he had repaired by noon the next day. He was always a text away with answers to questions and readiness to assist.
Five stars also for the great location of the place. In five minutes we could get to the Metro, and 15 minutes after you board you're standing at the National Archives. Grocery stores were less than a 10 minute walk in either direction and a convenience store was just around the corner. For the more adventurous (like us on the first day), we walked 25 minutes to get to the Capitol. Several great restaurants are a 15 minute walk away (we ate at the new farm to table place DC Harvest and left coupons for future guests).
Overall, I think the value was huge compared to a hotel or other option.
A couple of things to be aware of/prepared for on your stay. The space is fairly small - perfect for 2 but fairly cramped for 4. The kitchen can be a challenge for more than one person to occupy at a given time. As other reviewers have noted, improvements on the updating of the place are a work in progress. Once complete the place will really be a gem.
Perhaps the only complaint any of us had was that the upstairs could get quite warm at night. We were in DC at the hottest time of the year so some of that is understandable. Just be prepared if you are warm natured.
Finally, we all enjoyed the evenings in DC and would have liked a small space outside to sit and enjoy the outdoors.
In sum, we very much enjoyed the stay and the feel of the neighborhood. We appreciate Freddie's hospitality and would strongly encourage anyone to give the place a try.