Fairmont & Swissotel have both launched 40% off Europe Summer Sale for stays at participating properties until September 13, 2015.
This offer is only valid for bookings made through June 18. The offer requires prepayment, is nonrefundable and noncancelable.
Here are participating Fairmont properties:
And here are the Swissotel ones:
Price display for Fairmont Barcelona:
Price display for Swissotel Berlin:
I have been generally happy with the Fairmont and Swissotel properties that I have stayed at and have lifetime Fairmont Presidents Club Platinum status due to one promotion few years ago.
The sale prices seem to be real at least based on the two properties I checked. This is a vacation time in Europe and many business properties are rather empty.