The Mayflower is definitely one of the best hotels in the city. Rudy is great! Another great lounge is at the Key Bridge Marriott in Rosslyn. I haven't been there in about 6 months but used to spend 50-60 nights a year there. Beverly runs a great lounge in the evening. Very good food and lots of it. Incredible desert selection as well. Hopefully it's still the same.
I've stayed at both and the comparison is apples to just about any other fruit that grows on trees. I stayed at the Mayflower two years ago and it was the only time in all my Marriott travels that I was upgraded to two bedroom suite, and I mean suite. In addition, I and my family were given a full breakfast in the restaurant each day of our stay gratis since there wasn't a lounge (the wait staff must have been google-eyed with the tip I left them each morning). The location is superb and the service was even better.
But don't get me wrong, I had a very comfortable stay at the the Key Bridge Marriott but it's really out of the way (relatively).
"AAA rate of $69/night"
As an alternative, consider the Marriott Inn & Conference Center in Adelphi, MD (near Greenbelt) with a AAA rate of $59/night plus $8 for on-site parking. Free broadband/Wifi. It's about 15 miles east of DC.
King bedroom sitting area Desk in Living room area
Book online and request a comp upgrade to a 1 BR Executive King (Rm 476 or 576) and Concierge access in Comments area. Call the day prior to arrival to reconfirm the comp upgrade. Let me know if you need a contact. The 1BR suite is HUGE. Concierge is closed on the weekends so request comp BF vouchers (on arrival).
Duane was the fellow on duty for At Your Service and he was fantastic.
"I may change to the Adelphi property for our trip at Thanksgiving."
Considering the exodus from university campuses like U Maryland for the Thanksgiving holiday, one would expect that the AAA rate would be low at Adelphi. Factoring 'Black Friday' and the swell of travellers hitting the road and the malls in the Belt area (and everywhere), it's a major travel holiday weekend so the rate rises, but still very affordable considering a location within 15 miles of DC. Do book while available, it's always easier to cancel.