My buddy is a landlord in SE Maine.
However, he uses a management company that actually collects the rents. Screens tenants. Gets those emergency calls, etc.
Right now the multifamily properties that come up for sale around here in southern NH go so fast it is stupid.
There was one about a month ago went up for sale that I actually considered, briefly. A three family in one of the suburbs west of Nashua. It had a three bd rm. A two bd rm and a single bedroom apartment. All long term tenants. Rents were below market. Total rent of $55K/year. It had over six full price offers. It went for almost $100K over asking price. They paid cash.
My grandfather was a landlord for decades—no issues.
Today the markets are much more volatile and there is always the risk that state or local regulators will decide on anti-landlord regulations.
Some folks make a lot of money doing it—but I didn’t and don’t have the stomach for it.