First and foremost, landlords want to see that you have a steady income. They'll want to know how much you make and whether or not you have a job. They may also want to run a credit check to see if you're financially stable.
Many people need a co-signer to help them get approved for their future apartments. If you are looking for your first apartment, have poor credit, or pull in a low income, you will likely need a co-signer. This person is usually a parent, friend, or relative that will be listed on the lease along with the applicant. The co-signer will be screened for their credit score and income, along with the applicant. Both the tenant and the co-signer will be listed on the lease. Therefore, they will both be responsible for paying rent on time and covering any damages that might be incurred.
In addition, landlords will want to know about your rental history. They'll want to know if you've ever been evicted or if you've had any problems with previous landlords.
If you have roommates who will be living with you and are over 18 years old, they will need to fill out their own rental applications. The landlord or property manager will screen them in an individual process. They will also be financially responsible for paying rent or covering any potential damages.
Landlords will also want to know if you have any pets. If you do have pets, you should be prepared to provide any relevant details about them, such as breed, weight, age, and appearance. Keep in mind that not all landlords allow pets. If your landlord does allow them, you will need to be prepared to pay a pet fee at most places.
Finally, landlords will want to know what kind of person you are. They may ask you for character references from past roommates or neighbors. They may also ask you questions about your hobbies or interests.