I stay at the Marriott Tysons Corner very frequently (up to 3-4 nights each week) as a business traveller and know the place well. The staff, from Manger Shelly DiMeglio and the entire team, has been great to me as a "regular". I have definitely noticed an uptick in the professionalism of the staff over the past 12 months, especially at the front desk. With the recent addition of the new restaurant, the hotel has pretty much everything you need (bring back the steak fries, though). There is a large swimming pool which is great for families on the weekend. Logistically it is walking distance to the Tysons Corner Mall.