We stayed in this apartment for four weeks while our own apartment was undergoing renovations due to some water damage. It's in a great location (in fact, my work commute got shorter), parking was pretty easy, and I love the Mount Pleasant neighborhood.
However, just as many of the reviews say, this is a basement unit and a LOT of noise filters in from the family that lives upstairs. You can hear stomping footsteps, when the children drop toys, the things the parents are yelling, and the temper tantrums from the toddlers. The noise is worst from 7-8am and 4-8pm, but it pretty much quiets down after the kids go to bed. If you're already an early riser, it'd probably be fine for you.
This is a great place to stay if you're coming to DC and expect to be out and about doing tourist things or exploring for most of the time. The price is pretty good for the location.