I receive payments from a landlord to manager their property. Do I claim this income as " other income" or self employment?

A friend pays me cash to manage their rental property. They pay me a percentage of total rents every month, about 10%.

I don't have a business or corporation, but I basically take care of everything on the property and in turn they pay me for it.

How do i claim this income on my taxes?

Do i claim it as "other income" or do i declare my self as "self employed"

I don't have any other income.