Each unit is a 3 bed 1 bath.  

Follow that list of questions and then ask the mirror opposite of those questions and see if you the two answers line up.  

Some places, people are waiting in line for a rental.  

I could be wrong but at least this make sense to me and seems to be producing good results for my bottom line.

In general know where your plumbing, electrical and gas line are and then place your majors first and work around.

But with some unexpected disruptions, I suddenly find myself with 3 properties off-line, and my free cash flow looking more like -3150 per month.

If I read between the lines on this it seems like you have a fourplex for sale where the "potential rents" are $2,400.

Please tell me it was an indoor hydrant and stairs for the dogs to climb onto the bed.

The definition of “bad deal” here would relate more to the opportunity cost of such investment compared to other investments (financial markets), than a real financial loss for the investor (i.e. ending up with less cash than originally invested).Let’s now modify a bit our assumptions by including some inflation in our model (say 2%, in line with historical average).

Depending on where you live (no idea the usury laws of Canada), but 13% first lien could be considered usurious, so your interest rate needs to be in line with law.3.