We stayed at this Westin last weekend and had a very enjoyable stay. The room was clean and the bed very comfortable. I enjoyed the toiletries and the rain shower head which had great pressure. The staff at check-in were super friendly and made us feel welcome and at home from the moment we walked in. The pool area was clean and well-maintained.
My only complaint was noise from the parking lot during the night (other guests being very loud after a football game) but clearly not a fault of the hotel itself.
We'll definitely stay here again when in the Tyson's Corner area.