As a landlord, you need to be prepared for anything. While the vast majority of tenants will be quiet, clean and polite (for the most part); almost every landlord that has been around for a while will have a story about at least one tricky customer.
Whether you have a drummer in a rock band who insists on playing loudly into the small hours, a tenant who is flagrantly subletting your apartment or someone who thinks they’re entitled to redecorate the property… you need to be ready to respond.
Then there are the situations where the tenant is perfectly pleasant but you need to change the terms of your contract for whatever reason. Again, you need to know how to proceed in order to secure the best deal for everyone involved.