Selling stuff before leaving

Hello,

I am leaving the belgium in August end, I have some furniture and electronics which I need to sell to show my apartment empty to my landlord. Does any one know a place where I could sell altogether in August end. I am assuming selling one by one will take time.

I have ikea king size bed , whirlpool washing machine , sofa , utensils, coffee and TV tables and some give away stuff like microwave, monitor and cloth hanger

Regards