Depends on budget and your threshold for the balance of cashflow VS appreciation. 

You can get a loan for slightly cheaper depending on your credit score and LTV that you are looking for Ive seen as low as the high 5's to mid 6's on the interest rate 

Keionna Troupe, How you choose your realtor depends upon what you are looking for.

It depends on how long the rehab is and what your mortgage terms are.

Depends on how long the bank has owned the bank and if the property is a hazard to the community.  

It also depends on who your target market is. 

Depending on the region, painted concrete or tile works fine too.

It depends on what you want to do with it once you acquire it.

The age of the shingle roof is 20 years ++ and it might last another year or two depending how bad the weather gets.The contractor (sellers contractor) says they will issue a letter that the roof have atleast 5 years life remaining. 

As Ed mentioned, you might also need a separate bank account for the security deposits (if any), it depends if your state law requires it, go check.