I will guarantee you will have a million dollars in 30 years. 

While it does have gaps, they are more related to long-term maintenance and loss of earnings.Or prevent a personal guarantee?

Account ClosedYou should consult an Attorney/Accountant about entity formation.If there is one member doing work, you may want to consider having him/her being given a guaranteed payment.

The turnkey company guarantees rental for the first year, or they will pay the rent to me directly.

Neither is a guarantee but you're increasing the odds of success.

You'll guarantee the loan so they still use your credit history, but they look for the property to support itself.

But you already know that if he gets laid off, he will quit paying and he will continue to live in the home for free as long as he can.It's not a guarantee he will fail but there's an increased level of risk.

No one can "guarantee" the sale will close before they find another house.

I guarantee the cost of the hotel is higher than the rent they are paying, so while they may feel inconvenienced a bit, it is a real financial cost for you to do this for them and  (here is the important point you make to them) that you are not obligated to do, but are choosing to because you value them as tenants. 

well that's called a saber rattler letter.. big bluff 95% of the time guarantee attorney wont work on contingency so this lady / tenant would have to pay to sue you.. this stuff is handled in small claims usually.and your a long way from then winning a judgement.. if it was me I would just not respond.unless they actually sue you.. or if your really nervous about it send the 1500 back..you could talk to a PM probably for free that would know this off the top of their head .. short of that maybe an attorney would give you a free hour.