If you happen to have any referrals or recommendations for other private leasing arrangements, please let us know.

Very simple its a sales lease back arrangement.. they are selling you a property taking profit on that transaction then giving you a set return and then hope  to rent it out for more than your payment and make the delta.. 

Since I've never done a seller-finance deal I am hoping that the attorney I work with can help me better understand the legal/contractual arrangement and walk me through it a little. 

They suddenly found a key and arranged to drop it off at my real estate agent's office 3 days later.My agent went to the property the next day, opened the door and found furnishings still inside and a tv on.

@Marcus B Hsu Remember that you are providing value and that this is a mutually beneficial arrangement.

In my experience, providing comfortable sleeping arrangements for families is key to attracting and retaining guests in a vacation rental.Regarding your question, I would recommend considering the space constraints of the room before adding a twin bunk bed.

I just cannot wrap my head around how that could possibly even resemble being good or acceptable?

Taking equity in lending can get you in trouble, be careful not to get into a security arrangement.

I always suggest waterproof mattress covers, I have seen some people even use two at once, because if I have a couple booking my stay I know that it is possible they may have relations and I also know that can result in a crotch level spot that can resemble urine, so I don't get too worked up about it.

Maybe u can buy condo in Thailand better, I bought a condo in Bangkok in 2014, now I can get monthly rent fee and also can spend holidays there if well arranged my condo, good luck to u!