When a rental is taken out of service for personal use the accumulated depreciation goes away over a short period of time. 

What kind of seasoning is generally required as it relates to the rents/revenue as it relates to servicing the note, etc...I currently own one PadSplit (acquired via Subject-to) that has been up just over a month.

First all, thank you for your service and kudos for making that sacrifice to househack it's definitely paid off!  

Make sure to verify any information from a party that doesn't have any advantage of you getting their services before making a decision.  

Is there a certain direct mail service they prefer?  

They repeatedly charge me for cleaning services while my property has been vacant for 2+ months.

The general rule of thumb when using debt is to ensure that whatever asset you buy with the debt should make more than the debt service.  

Having a lease in place will help you as well - some lenders won't refi a vacant property.For your refi, you're usually looking at 75-80% max LTV with a debt service loan.

Owners mistakenly ASSUME all PMCs offer the exact SAME SERVICES and PERFORM those services EXACTLY THE SAME WAY, so price is the only differentiator – so, they often select the first PMC they call or that calls them back!

You would be violating Airbnb's terms of service.