Hotel for Catholic Nationals is:

Marriott Hotels & Resorts > Hotel Washington Marriott Wardman Park
2660 Woodley Road NW · Washington, District Of Columbia 20008 USA

This is the tournament hotel.  While still somewhat expensive, it prevents a lot of transportation challenges for us by staying at the tournament property.  LD rounds are at the hotel, EX rounds are at George Mason in Fairfax and all quarterfinals rounds on are at the Marriott.