It has a great mobile app that lets you snap receipts and later match them to transactions, keeping everything organized.

You may be safe to get non-commercial F/F adding up to 2 ADUs to a duplex even though by rule this does not qualify (in my area I have never heard of this being an issue). 

I started out with a house hack, and I would say that that was definitely safe for me when I was in college as I could afford the Mortgage even if my renter didn't pay.

I would love to know the outcome of all who have posted or have experience completing a transaction with them.

I'm assuming that this situation wouldn't pass inspection, but one could argue that all the spaces the guests have access to (i.e. bedroom, bathroom) are safe and habitable + the guests wouldn't be exposed to the kitchen.Also, do the city inspectors inspect other parts of the home the guests won't access (i.e. inspectors check the basement for water infiltration even though no guests would ever be living or even going down there). 

Consider transaction costs as well as losing the principle residence exclusion.

I already have a Stessa account which can be connected with a bank account and has the benefits of collecting rent and keeping track of documents, receipts and transactions.

Always use your own buyer's agent in any transaction. 

Then you can safely complete the 1031 exchange. 

It’s essential to confirm this early in the transaction.