Private landlords are a gamble. They are better on the average, but the variance is also higher. Because most private landlords only have a handful of properties, it's effectively impossible to know in advance what they will be like if something goes wrong.
My Son lives in a "mega landlord" unit in Saskatoon (Canada) and it is well maintained and his rental fee is very reasonable.
My Son-in-law lives in a "mega landlord" unit in New Jersey (USA) and it is also in excellent condition.
I personally rented from a private individual in Connecticut for several years and it was a slumhouse.
Landlord was never around, no one to call when things didnt work. we actually had to fix the heating system in Jan because we were freezing cold and the owner was once again MIA.