as far as cost that depends on too many factors to cover! 

Neighborhoods to invest in is a more subjective topic as that is often dependent on the type of investment you're interested in, your price point and even the type of tenants, if that's the route your going,  that you are trying to attract.

Depends on the city & airport. 

That said, the other agent and I frequently reduce our commissions on these deals to make them work and, even if the agents don't, the seller would still be getting around 3% at closing with a 10% down payment which, to me, could be a win-win depending on their situation.  

Each program is a little different so it just depends on your situation and income.They are quick and easy though once you get your certificate you can work with any Bank or Lender that is approved to use those DPA's.

It depends what your goal is.

Section-8 rentals are great because of that dependable income.

As others have mentioned, DSCR loans are generally for turnkey rentals (although outdated rentals may still qualify depending on the level of deferred maintenance). 

Quote from @Paul Lucenti: It depends what you're looking for.

Both Conventional loans and DSCR loans can offer this flexibility, depending on the specific scenario and borrower qualifications.