IT freelancing

No. You use the normal jobsites and apply for assignments through the agencies who advertise there.

Stick your CV up on www.ICTjob.be and see if anyone calls you.

First thing. Do not withhold rent under any circumstances. You will be in breach of contract. It cost friends of mine equivalent of about 15 months rent when it came to court.
You need serious professional legal advice. Not uninformed comments from people trying to help here. Belgian property rental laws apply and whatever you might consider fair or reasonable is irrelevant.
Suggest you start with an urgent visit to a Notary. First visit is usually free. They should be able to advise you and point you in the right direction.

happy wheels apk online.

Occasionally there are some freelance postings on https://techjobs.be. You might want to take a look.