The goal of keeping fair rent on a property is to attract tenants, cover expenses and hopefully put some money in the pocket so that a void period can be compensated.
In that hurry setting a standard price for all one bed-room apartments or maintaining a standard difference between one and two bedrooms will be a mistake. If the units are not identical it will hurt. So charging slightly different rents on the basis of desirability of a unit will be a fine approach.
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