Make them based on what your tenants need (not want) which would also allow for them to customize (furniture use) to their tastes.I wrote a book on this a number of years ago that touches on a lot of these things, but it was focused on my specialty, "Energy Efficient, cost effective homes". 

If not, its iffy, have seen it go both ways, but the long time that it has been verifiable (1972) speakes strongly in your favor.

A squatter is not on your lease or subject to its terms.

"Saturated" is a bit of a throwaway term IMO - I manage STR's on Oahu and while Hawaii is about as "saturated" as it gets with STR's, people are making great returns on the right investments.

You are not required to pay upfront costs (and shouldn't, in my opinion.)I require written verification from utility companies (water, gas, electric) that utilities have been assigned to Tenant effective the first day of occupancy; no confirmation = no keys and lease approval withdrawn).

The opportunity for outsized profits versus LTR always exists, because it requires much more work in terms of marketing, maintenence, cleaning.

If you plan on staying long term lower down payment is not as meaningful as it is if you only plan on staying for a few years. 

I think as long as you let them know you are providing services and will get paid for it.

You will certainly pay a premium for turnkey, but if your long-term goals are appreciation and stable yet modest growth, it is certainly advisable.

I'm Joey Prainito from Long Island N.Y.