There is a portion on the back of the form "for Residential Type Properties Only" is this the only section I need to complete?

Seller finance and only pay taxes on the portion received the first year (Maybe zero if they don’t last 9 months)Lastly they might be able to just rack up the bills up paid and have them paid by the estate. 

If you can get into some properties in Salem or Nashua that might make sense too but the tax bill might eat a good portion of your profits. 

If theyre just going to send you a portfolio booklet or send you to a website of all their listings tell them to pound sand.Yes it's vitally important to know who you are working with, and have the history of the players involved.

Well, that is very persuasive ... it's also the first time I've heard anyone say they, or someone they know, is getting a significant portion of their STR bookings from direct sales. 

House hacking just means that you are living there on the property while others will be helping pay all or a portion of your mortgage and other expenses.

Go put one together.Without one of those no one can tell you what you should do correctly and in any case you have no basis for valuing one persons advice vs someone else.If you did have an IPS, it would most likely indicate that the recent run up in real estate prices means your RE portion of your investment portfolio is over weighted. 

Her father is on board with the sale and even generously offered to give us a portion of whatever the net sale is.

I lived in the home for about a year and a half and during this time I rented out the other three rooms which allowed me to only pay ~$200/month plus my portion of utilities.

Do you refund them the remaining days of the month or do you have the tenant pay for the whole month regardless or a portion?