Also, personalized post card size info/thank you card with the top 5 restaurant/bars or attractions in the area.

It takes walking new investors through the process from real life lead generation to acquisition, renovation and disposition. 

While you are at it, put the next person on MTM to create some equity in the contract when you have problem in the future.

However, her life changed and she only stayed for the first year.

I personally haven't sent postcards, I've had good luck with PPC and Video ads. 

So, like everything in life, the work you put in is what makes you successful here.

No Personal Use: You or family members cannot live in or personally use the property.2.

For example, at the start, do you confirm if all persons in the house are aware of your presence, and do you ask if it is OK for you to open bedroom, bathroom and closet doors?

While I've never invested personally in Detroit, my usual word of caution to investors in these "lower cost" markets is that while cashflow is great on a % basis, make sure to look at the actual quantity of cashflow. 

i think this is a decision only you can make. im in a similar boat (house hacking my primary) and considering renting the whole thing out to get a solo home for myself. certainly a lot of appeal in that, given how much work goes into the house hack. but whether or not the numbers on cash flow align is up to you. personally i dont think $150 (seems like about 12%?)