In discussing the deductible expenses with my CPA, I mentioned having records for travel related to repairs I performed at the property, plus my meal receipts (the trips were entirely business related). 

Travel the areas you want to buy, look for the properties that needs help.Contact owners and make offers

If you don't plan on living there I would recommend keeping it close to your primary residence or on the way to and from an area you travel frequently (Like work or something) Driving an hr or so out of the way each time there is an issue will really start to be annoying after a while trust me!

Weather impacts house shopping, traveling ( spring break) keeps people away from house shopping, etc.

That said - any way that you can add gaps between up and down is going to prevent sound from traveling down. 

Lately, I have been traveling a lot so I'm rarely home nowadays but I was wondering if I were to put my condo's 1 bedroom as a private room on Airbnb and give the customer access to everything in the unit except my own room, do I need an LLC?

Safe travels and hope to host your next trip to Cambridge.Don't forget to leave us a review on Airbnb! 

If their is something I ask them not to do like not smoking in the house and keeping their things picked up in the yard.

My job often requires me to travel at a moments notice.

Is your travel nurse income W2 or 1099?