Here are local accommondation in Haderslev, listed by cheapest first.
Danhostel Sportel
http://www.danhostel-haderslev.dk/overnatning/sportel/
Affordable and comfortable overnight accommodation with a fixed price of 625 DKK per room, no matter how many you want to stay! 4 beds in a room.
Distance from Training 2 km
Danhostel Haderslev
http://www.danhostel-haderslev.dk/
Surrounded by greenery beside Lake Haderslev, this property is 5 minutes’ drive from Haderslev town centre. Wi-Fi and parking are free. Facilities include a guest kitchen, TV lounge and laundry room. Typical price for two nights (twin room): 1020 DKK
Distance to training: 1.1km
Airbnb
Airbnb.com
Plenty of comfortable and practical apartments around the centre of town during the seminar. Typical price: 617 DKK- 1291 DKK (prices vary)
Distance to training: 1km-4km (varies)
Hotel Harmonien
Set in a heritage-listed building from 1799, Hotel Harmonien is 25 m from Haderslev’s main shopping street. It offers free Wi-Fi and parking, plus an à la carte restaurant. Typical price for two nights (twin room): 1850 DKK
Distance to training: 1.3km