How many owners check the hoses to their washing machines, ice makers, refrigerators, under their sinks, etc. on a very consistent basis (if much at all)? 

Heating costs go up in winter, as does electric due to the reduced natural light and people being indoors more.

If you can work with them on a rental price and tie them into a year long lease that stipulates no smoking indoors then you'll be able to enforce it and keep the cash flow.

I have indoor pools in my STRs and my insurance company requires me to have guests sing a rental agreement with specific verbage that they provide,

After closing I introduced myself to each unit and everyone was so friendly besides the trouble maker.

although good luck every having a house free of mold,  anywhere you have people and indoor spaces there will be mold eventually.

Some of the personality disorder folks are super good at garnering sympathy and making themselves look innocent when they are sneaky trouble makers-- you ignore their **** at your peril.

It was a huge joint effort to cause what should have been great money makers into total disasters.

Your other options are to consider non-renewal of the lease as you might have to just tough it out until the end of the lease.If you do need to stick it out with the tenant until end of their year lease, I would now define that cashiers check, money order or cash are the only acceptable forms of payment due to her history of bounced checks. thats also in my lease that its my prerogative to demand certified funds... this way there are no further excuses with check problems and you can go straight to filing if they are late....pretty bold going on a cruise while rent check bounces.. their priorities are all out of whack.... they need to know that their stuff goes on the curb following an eviction and they need to re prioritize their finances to make rent number one.

Prior to moving down to San Diego county, we both played professional indoor volleyball (which is an actual job, believe it or not) overseas and with the US National Team.