I think more things need to be classified as “inherently dangerous.”  

Ontario welfarians are generally on the lower end of the scale.Some may not be classified as wholesome but that is not the landlords problem.

Managing a PM does require experience in being a owner landlord and I believe necessary experience when the number of properties warrants a PM.Personally I have learned that managing a few properties is far easier and more rewarding than managing a PM.Being a investor in income properties may be classified as a passive investment, not really, but being a landlord is defiantly not.

A good tenant takes should be classified as one that is doing everything right not most things right, my advise is if you're new to this to start setting your bar a bit higher which will make your life infinity easier over the long run. 

@Kerri Mcilvain Act as if you are the renter and go searching through Craigslist, Zillow, classifieds, etc. to see what the going rent rates are in your area. 

Another issue people have is they classify service animals as"pets" when they aren't.

With 4 units you are maximizing what your deposit/loan gets you, if one unit is empty then you still have 3 generating cash, etc.Once you start looking at 5+ units, they are now classified as commercial real estate so financing changes and so does insurance.  30 year fixed with 25-30% down and low fixed rates are no longer an option, you have to get a commercial loan, which from what I have seen means a higher interest rate and shorter term (20 year max I think). 

For starters, many A-class cities have apartments that have negative cashflows but can be classified as good/stable investments (for folks who simply need to park cash).Like others said, whether it is a good idea is dependent yourself as a whole.  

How much violence has to occur within a specific area for it to be classified as a war zone?   

Even with obese people now being classified as disabled, wouldn't that mean you could still require them to "modify" your unit to, for instance, a bariatric toilet, and then modify it back to normal, or be able to hold them responsible for any damage they do to the regular toilet or plumbing if caused by their weight?