We’ve also tried talking to the neighbors directly, but they don’t acknowledge the issue or make any effort to address it, on the contrary somtimes they are extra loud in spite. 

From my understanding, mortgages are considered riskier investments than most other loans because the borrowers can repay early with little to no extra cost.

A lot of them charge much higher and include extra "material" but if my experience tells m anything, you won't need that. 

Whenever something pops up that you need an extra opinion on just ask the investor what he would do and take action.

You have incidental expenses of an extra 3-4k on the rehab maybe.

If the note holder purchased the note at a discount he can accelerate his profits and increase his ROI by offering the borrower an incentive to pay off the note early, or to make e extra payments.  

Always budget for extra for rehab.

Like if you want "property management" as part of your software its extra. 

Vrbo has free price automation software.I use Excel for book keeping.I don't pay for any third party software, not really needed on 1 or 2 properties.I charge a little extra for cleaning fee than actual cleaning costs.

Some things matter more than saving an extra $200/month because you chose to live in a market you didn't necessarily like.