anyone own rental properties on here?

I have 4 rentals 3 houses and an apartment.
Got lucky all of them left to me by by grandparents, so no mortgage.
My best advice is, references and rent to older single people. No kids or pets, or anybody under the age of 40.
Be able to fix 90% of whatever goes wrong yourself, and have at least $50,000 cash in the bank to pay somebody on short notice to repair something. A furnace will break in the dead of winter, quick fix makes for happy tenants.
Happy tenants make good renters.