She has complained that the AC was, making funny noises (it was fine), that there is an issue with the metal roof (there isn't), that she thinks she has carpenter ants (not likely) and just generally annoyance.Has anyone had an issue with a tenant who always seem to have, often imaginary, issues? 

I’m nervous that it will be tough to retain future tenants due to the noise issue.

For example if there is  noise or on street parking that is prohibited they should complain to the police.

If they don't get along with their neighbors (or neighbors confront them about noise or disorderly conduct), they will text you with a frivolous accusation about the tenant in question.

So when shopping understand this is how you shop for insurance and then try to get an apples to apple comparison or at the very least make your agent work to explain any "liabilities or what is not covered" on the policy if they can't rattle it off easily then they are not fimular with the product they are selling and really should not be selling it. 

I'm also interested in how you search for, or find all the noise around developments in an area.  

There are but I can't rattle them all off the top of my head but one of the new ones extends notice that you must give if raising rent over a certain percentage from 60 to 90 days

For example, once they called saying the refrigeratior wasn't working right because it was making weird noises.

The little clanging noise they make when I open the door is not the least bit annoying--in fact, the louder it is, the bigger I smile.

I was then told that they may be willing to sell to me at $260k (so obviously they had at least $20k in mark-up at their OG price, which by the way is fine if the deal had a good spread, this one was bare)With that reduction in mind, I went to the property.It was very close to the freeway and the freeway noise could be heard quite loudly from the yard and slightly from the inside with all doors closed.