The market has a way of keeping itself level, when the market goes down like this it has a habit of overcompensating before leveling out again to normal, in which if you buy a property now and sell it during that overcompensation period, you can get the most “ bang for your buck “

I did the analysis for turning it into normal rentals by combining some of the rooms. 

Also I would not want one of my kids to have to go into my or the other kid's bedroom to use the bathroom...especially when they get up during the night and wake someone up!

When you talk about "finder's fees" I don't know if you're talking deal assignment fees (which we do pay and are normally 5% to 10% of face value of deal) but if you're talking about a "buyer's broker" I would not touch that as it will end your access to "pocket listings" which are the best of the broker's listings (and not publicly available). 

Help for Airbnb and Vacation Rental OwnersWhile long-term effects on the short-term rental industry are debatable, here are some things you can do right now:Reduce your vacancy rates as much as possible by offering discounts and being more flexible during this timeCut your expenses by eliminating welcome gifts, reducing amenities and subscriptions or applying for mortgage deferral programs, as discussed aboveIf you’re an Airbnb host, apply for cancellation reimbursement under the $250 million Host Relief Fund available for qualifying cancellations (up to 25% reimbursement of what you would normally receive from a canceled booking)Consider turning your short-term rental property into a long-term rental, at least for now, as the traditional rental market is not expected to be impacted as severely as the short-term rental market  Additional ReadingResources for Property Owners and Agents from the National Association of Realtors is a great list of general recommendations and resourcesList of Relief Programs Offered by US Banks, published by the American Bankers Association, is a comprehensive list of specific measures banks across the US are taking to help borrowers in needCOVID-19 Tax Resources Center by the Drucker Scaccetti tax services firmLegal Guide for Landlords by Julie Anderson, written for the Mid-America Association of Real Estate Investors, provides general legal guidance and advice for real estate investors  Please let me know if I missed anything, or if there is any inaccurate information, so I can correct it.  

This is my first investment property, I guess I'm paying my tuition to learn how to deal with these types of individuals.I would also include in their damages the cost difference between a normal water bill and the high water bill from (I assume) the month they filled the pool. 

If you give them $20 off, make sure they know the rent will increase as it normally does for year 2. 

Just remember that they normally take 75% of the rental income for their calculations.

Under normal circumstances though yes evict them.

My advice: get standard, normal houses, no funky layouts.