You want to get the best return possible from your rental property, then you need to set the rent at the appropriate level. It is based on several factors:
Location-is your property in a desirable location?
Furnished or not? What is included in terms of furniture and appliances?
Target tenants-who are you trying to attract? Families, students, professionals?
Amenities-What is nearby? Schools, leisure facilities, shops and restaurants etc
Desirability-what condition is your property in, how big and how accessible is it?
Don’t forget to check out the local market to see what other properties are rented for.