You'd think living in an apartment would limit your decorating options, but it doesn't have to. Sure, you can't paint on the walls unless you're willing to forfeit your security deposit, but that doesn't mean your place has to be drab and dreary-- quite the opposite, actually. You have many choices for how to add some color to your apartment.
Are you asking, "What do I need to rent an apartment?" Like a job application, an apartment application requires you to attach additional documents. Simply filling out the form with your information and a list of past apartments isn't enough for the landlord to decide whether you're reliable as a tenant. As such, he or she will ask for more items that will show that you're on top of your game.