If you want to contact the landlords, you have to be a Premium member.
Your can get a 3 days trial for 15 DKK. After the trial the membership is renewed for 28 days for 299 DKK unless you unsubscribe before the end of the trial.
Read more about the membership here:
You can unsubscribe your membership at any time.
Signing up for the trial you also sign up for automatical renewal of the membership. So it is important to remember to unsubscribe the membership when no longer needed.