Unless you have a "roommate agreement" with respect to the unit you are renting with your roommate, you two have to work things out between you as to rent, cleaning and the like. In essence, you have a lease with the landlord to rent the unit you have where presuably you pay half of the rent and expenses.I suggest that you consult with your roomate your concerns over your room, costs and the like and reach a written agreement as to how your living arrangement will be and what costs you will incur.As to privacy, you are entitled to it.Many of your concerns should have been memorialized in a writing before you ever agreed to rent the unit you are writing about.