Later on, if you decide to open a business account, you can typically switch the account for your loan payments without any issues.

I doubt if you'll have any issue with your hold period since it is all about your intent anyway.

I haven't had any issues dealing with AirBNB...yet.

The reason why, you're likely going to have issues with raising rents on your newly acquired tenants.

Since the trust is a disregarded entity, the benefit is bypassing  probate, not tax issues or liability concerns. 

By creating a process, you can prevent these issues from taking place and save yourself a lot of time, trouble, and money.

Regulations & Compliance: What's the best way to research local STR laws and avoid potential regulatory issues?

UPDATE:  After 4 days of back and forth with Airbnb CS, they finally decided to do the right thing and issue my payout for a reservation that a guest cancelled in the amount of $1,333.75. 

You need an income that meets three requirements:Rents increase faster than inflation to offset constantly rising prices.It must be reliable; it continues even during economic downturns.It must last throughout your lifetime.These are all long-term requirements, so the current interest rates are not the major issue.

But if its not related to that type of water damage, the other questions ask about present tense issues, and not past issues.