This is a good hotel, has all the amenities you want at a good price point. I stayed for three nights, and though the decor is dated, and a renovation is clearly needed, the beds are comfy and there are good toiletries and towels in the bathroom. Slept well.
The best thing about the hotel are the staff, they're are excellent, they were very helpful arranging the hotel's shuttle to and from Dulles and to downtown Leesburg for me, as well as giving me good advice on the local area.
Plus points are the price point, airport shuttle, staff quality and free breakfast.
Downsides, smoking is still allowed in this hotel so the corridors can be smoky of a night as people go for their cigarettes at the end of the corridor. Hopefully Best Western will go smoke-free very soon, and the doors could be a bit thicker to insulate noise from the corridor, but that's a minor gripe.
All in all, I'd recommend, good place for business travellers for Leesburg / Dulles.