From our London office:

Settle into an 18th-century Georgian mansion in one of London's most exclusive neighborhoods for $127 per night. The 4-star Millennium Hotel Mayfair cropped 50% off regular rates and added the following:

• A free upgrade to a Deluxe room (Regularly $325)
• A free glass of prosecco in the bar ($11 value)
• A 20% discount at Avista restaurant, ranked 2 AA-Rosettes, an accolade of culinary excellence
• Weekend parking rate of $15 per day (Regularly $64) 

Deluxe rooms cover 387 square feet with a king bed and seating area. Add full English breakfast for two for $7.50 extra per person.

The hotel is nestled in London’s fashionable Mayfair district, which houses the U.S. embassy, luxury shops and some of the most expensive real estate in the world. Overlooking Grosvenor Square, it's within easy walking distance of Green Park, Buckingham Palace, and the shops and boutiques of Oxford and Bond Streets.

Travel August-September.

Blackout Dates: Sept. 13-17, 20-24, 28-30 

Book by July 14. 

Bonus: The first 30 bookings receive a free upgrade to a Studio, which normally costs an extra $160. Stretching 452 square feet, it comes with a king bed, a sofa with a pullout single bed, and access to the Executive Club Lounge with complimentary continental breakfast, Wi-Fi, broadband access, tea, coffee and canapés. Note: Book right away for a chance at the free Studio upgrade, or pay an extra $75 per night to guarantee it.