They are the unicorns of the rental world: landlords who agree —nay, support or even pay for — cosmetic changes to your apartment. We’re not talking about running toilets or the other functional stuff that makes a place habitable. This is the good stuff: replacing chippy linoleum countertops with stone or butcher block, or bringing kitchen cabinets out of the 1980s and into present day. There are ways to make your case when you move in, and creating a situation that works for everyone.