I think it depends on your state. 

If nothing else, put a few dollars in for giggles - most of us on here can afford to “play” with a little cash (whether that is $50 or $50k depends on you) Why on earth wouldn’t you play with something that can potentially triple your money in a week or two?

If you can sub-meter the water that is always preferred it just depends on how feasible it is to do that. 

HEy, I am living in Poland now, this permit should not be too difficult to get depending on what type of investment! 

Book keeping/tax prep costs the same.Expenses will vary depending on the market The cost of doing business varies from municipality to municipality.

very house dependant

It depends on the market, the location and the type of single family home.  

If it is working with subs, a GC license won't help that in any practical way.At the end of the day, it depends on what you are looking to achieve.  

Although it also depends on your projected usage and average length of stay.

There are some DSCR lenders that allow this structure, it just depends on what your goals are.