The opposite of "more rent" can be described in different ways depending on the context. For instance, if we are talking about landlords who charge high rents, the antonym could be "less rent". In this case, tenants would pay lower amount of rent for their accommodation. Moreover, if we consider the issue from a tenant's perspective, the antonym of "more rent" can be "cheaper rent". Renters who want to pay less for a place to live can seek affordable housing or negotiate with their landlords for a lower rent. Ultimately, the antonyms of "more rent" are less rent and cheaper rent depending on who is being referred to.