As informed by gObl, Special A1 Business Hotel Deal for TLSA:
"The 1-a Hotel http://www.1a-business-hotel.de/ will provide
Two-bed rooms for 59€ per Night Three-bed rooms for 89€ per Night
Direct your reservation to: email@example.com and use the subject " E-SPORT EVENT 17-19.11.2017"
The Email must contain: Names, Number of people, what kind of rooms, a credit card number with expiration date. You can pay at the Hotel, the credit card number is for insurance of the hotel. The Hotel is within 5min of walk to the Venue."