We found the rooms just as shown on the pictures and it felt like there was plenty of space for the 4 of us.
We could not eat out every night as a family - but we would strongly recommend the area for bars and various eateries. There were plenty of them within a few minutes walk of the apartment and the Metro also only 5 minutes or so walk.
As a result, we often cooked and washed up within the apartment. We suggest a larger sauce pan (due to being 4 of us), a couple tea towels for drying pots, a few more mugs and a wooden spoon. But please note these are minor, but constructive points. We enjoyed our time there - it was a great location and we felt very safe (both night and day) walking around the Dupont Circle area. The locals were friendly and helpful. It was a great base for 5 days in DC.
One review referred to construction work next door. We never really noticed much noise because the work was almost complete apart from fitting-out and finishing touches. So not a problem at all.
We enjoyed the Bagels at a cafe called "Bagels, etc". This is approx 2 minutes walk down the alley way (that starts almost opposite the apartment) and the café being at the end on the right corner. Great for breakfast! Also only a little bit further to a super market for all sorts of food, if you're looking to do your own cooking.
We would recommend staying here.