Stayed at the SpringHill Suites Fairfax for one night. There is ample parking available. Not a very scenic location, but if you need to be in northern Virginia its not too bad. Not very easy access to public transit if you are heading into DC for the day.
The rooms were large and clean. Not traditional suites, as there is a small half wall that separates the bed area and the living area rather than two separate rooms. Think of it more as a large bedroom than a suite. There was a small kitchenette with a mini-fridge and microwave.
The lobby is nice. Very good continental breakfast with cereal, waffles, eggs, coffee, juice, etc. There is also a small shop next two reception that sells candy, drinks, microwavable meals, etc.
Overall, a decent choice but nothing outstanding.