I have told landlords when I was renting a room, etc. that if he had an extra bedroom in my unit that I would screen the tenants. He would say yes and give me a break in my rent. Before that, he would let anyone rent the bedroom and there would be problems like he would play loud guitar and when I asked him to keep it down, he threatened me with a baseball bat.
When I would screen roomates, I would put an ad somewhere, they would fill out an application, I would check there references, and never had a problem. Most landlords put an ad somewhere, don't have them fill out an application and wonder why they have problems with the tenant, not paying after the first month, trashing the place, etc.
I unfortunatly have not been the best when I put an extra bedroom on airbnb, they rent the room (no application) and then they want to rent it month to month. I have done this twice where I didn't have them fill out an application and have had problems. Fortunatly when I asked one guy after renting the room for a month (he was getting on my nerves) to leave he did.
This time a girl rented my extra bedroom on airbnb, she stayed a month, then asked to rent it for $850 per month while she looks for a job and a new apartment. Fast forward, she has been renting the room for nine months and gets on my nerves if there is a problem. I have asked her if she can find a new place and she says that she can't find one. Evictions I have been told can take 8 months here in NJ, don't want to go that route, so I just stay out of her way.
I also have a rental property that I bought and rehabed and my re agent got me a good tenant who had a good job and he took care of the place and paid on time for 3 years. He bought a condo after his dad who was living with him passed away.
Then I cleaned up the house, my re agent got me another tenant and so far is paying on time, I was able to get a 14% rent increase over the previous tenant.
This is not a passive income business I guess unless you pay a property manager to do the work for you, they probably take 10% of the rent for that work I think.