Do not communicate with the tenants except as advised by the attorney.

Also, clear communication with your parents about goals, risks, and expectations will also help avoid tension.

One small tip: keep your communication channels clear and open with your property manager.

On the other side, the bigger companies have more experience and their numbers tend to be more accurate (not always)... as they are big companies "their costumer service" and communication is better but at the same time they "have more mouths to feed" if we need to be honest so can get a bunch of ok or good deals but I kinda doubt they will be great (just my personal candid opinion).

Assuming you already paid for the first occurrence, if it happens again and the plumber doesn't find anything wrong then, yes, the tenant should be responsible for the invoice.Your PM should be setting those expectations when they communicate with your tenant."

I would work on my communication of my processes including letting them know asap of their schedule with me. 

Is communication prompt and reliable, K1 delivered on-time?

We communicate almost everyday.

Our architect has been slow to communicate and get the work done.

It may be that they are underwriting the property at a significantly different valuation than what you are using or that they feel that you or the deal is excessively risky.Great advice here, and a good HML will have an account rep or someone to communicate with you through the process so that you know.