Once you master it, its an awesome tool.Like the other members say, you can easily find it online, however, i strongly recommend you watch the videos (that come with the calculator when you buy it for a lil over $100) so you can learn how to use it properly.

I understand why this is the choice asset for many: they are inexpensive with no barrier & easily financed (easily attainable). 

Average rents are $1,250 (Again Zillow) Easily a losing propostion.

A great deal will easily sell itself. 

A mid-term rental could be an great option during the 6-7 months you're away since it appeals to traveling professionals, remote workers, or individuals relocating and offers stable income without the constant turnover of short-term rentals.

Are you able to reduce your expenses quickly and easily if needed?

A place that is easy (and hopefully) inexpensive for you to travel to a couple times per year to check in on things.  

But as far monthly payment you could easily buy a house in a cheaper location have less roommates and the same monthly payment or the same number of roommates and a lower monthly payment.

If experience is your concern, you can easily partner up with another experienced investor in your area to help balance the risk out. 

Are you able to use it easily, only with a HELOC.If you lose your tax deductions, then Uncle Sam is happy to take more of your money each year.Good Investing...