Accor Hotels offers a 20% discount for stay Germany, Austria and Switzerland, all you need to do to get this discount is to book 7 days in advance.
Offer is vaild until 30 June 2014.
To see more, click here. Page is in German so you may need to use google translate.
Our rate analysis shows no different rates than what is filed with major OTAs for our test hotels though 🙁