If so, having been in their shoes, it is not trivial to open a bank account until you get a SS#, etc which takes a few weeks or months after arriving.In some countries it is not unusual to pay at least a few months upfront. 

They then started receiving notice of (IMO) unusual feedback - that the security deposit would not be refunded in full because there was dust on top of the washer - stuff that just doesn't sound legit.  

If you are interested in doing any development, especially anything unusual like tiny houses or pocket neighborhoods that typically require re-zoning or special use permits, neighbors can get very alarmed and protest those changes to the zoning board.

Is this unusual wording?

This is quite unusual in that, if I wanted to check on my property I text my tenant and get a response back within a day confirming when I might be able to do it! 

That number (19 of 22) is unusually high.

If the tenant takes an unusually long time to get to the door and/or opens it only a crack when they see you, there could be something going on that they don't want you to see, such as breaking property rules... unauthorized smoking, unauthorized pet, unauthorized occupants, etc.7.

Thirty calls in a day is not unusual for us, I'm sure it does vary by area.  

One apartment had everything needed, was unusually well maintained, a great location, very generous square footage, nice bathrooms, and plenty of natural light.

That is extremely unusual and sounds like BS to me.