My question is have I done everything I can and how do I deal with such unreasonable people?

I didn't think it was an unreasonable request that since I was there only a week earlier and specifically asked them if they had any issues with bugs, more specifically ants as that sometimes crops up in the spring at this house.

I would love to quit my job and do real estate full time. but it'll be another year or two before I can do that.I think it's unreasonable to expect a young person to decide what he/she wants to do for the rest pf their life when he/she has done nothing and experienced nothing.

We are trying to be as reasonable as we can with this isue but our landlords seem to be being as unreasonable as posible.

Big project...the numbers don't seem unreasonable.

Many factors go into turn time and from a PM's perspective, it can be tough setting these expectations for our owners who may only have a single home that they used to self-manage and are expecting a maximum of 3 days (unreasonable).

She still feels its unreasonable to ask her to pay for the plumber.

Its another thing for it to go out.  68 does not seem like a completely unreasonable number.  

Seal off any entry points.I highly doubt it came with the tenant - this isn't a 1/8" cockroach.Also, don't consider the rent in this - you should have rented it broom-clean and free of infestation irregardless of what you charge compared to the market.If it got in in that one month, find out how, seal it up to prevent others, and kill the occupants (the rats, not your tenants).As far as the timing of their complaint vs. response- yes they are unreasonable, and now they can eat the cost of THEIR exterminator.

They seem to have unreasonable expectations and that usually clashes with landlords.