"Rent-seeking" is generally a perjorative term.
I let out a family house. The rent is the greater part of my pension. I used to live there, until I was divorced (it was too big for one person). It's been clear to me for decades that freehold land was a better investment (here) than investing in a conventional pension; and I lived through the outright theft by Robert Maxwell of the whole of his staff's occupational pension fund. So I paid off my mortgage as quickly as I could.
Regarding the chores, that someone mentioned upthread: I have a long-term tenant, a family. Their kids go to school around the corner. They mow the lawn. They always pay the rent by bank transfer. I hire tradesmen to deal with the gas, plumbing and electricals. I visit twice a year to check that everything's OK. These aren't really problems.
And rental housing is scarce where I live. It's a university town with several important hospitals, and surrounded by a no-development green belt. I'm providing a social benefit.
I'm not sure when this kind of "rent-seeking" turns into the kind of rent-seeking of which people disapprove.