Though sometimes used interchangeably, the terms "cosigner" and "guarantor" don't typically have the same meaning. Cosigners may live in the apartment or not (roommates named in the lease are technically cosigners) and share equal responsibility for the lease's requirements for the duration of the lease.
Write the contract in six steps Start with a contract template. Open with the basic information. Describe in detail what you have agreed to. Include a description of how the contract will be ended. Write into the contract which laws apply and how disputes will be resolved. Include space for signatures.