Courtney's description of her place is spot-on. A friend and I stayed there for a week, and we found it clean, roomy, and comfortable. Having off-street parking available is a plus. Some of the best restaurants in DC are located in the Mt. Pleasant neighborhood so you don't have to go far for great dining experiences, and the Columbia Heights Metro station is only a 10 to 15 minute walk away.
Other guests have noted the low ceiling heights, which might be a problem if you're tall, but for a couple 5'6" women it wasn't an obstacle. Also, if you're not used to the pitter-patter of toddlers overhead, you may want to pack some earplugs.