From The House Hacking Strategy, published by BP (and I'm a case study in the book), Craig talks about the profitability to comfortability scale.

I have had one, and now that I have been taking care of many aspects I feel more comfortable taking care of this myself.

If you're going to do this type of deal, just make sure you're comfortable with the possibility the loan may get called and you could have to refinance. 

I'm leaning towards the SF home, but my wife is wary of spending that much on a SF home and feels more comfortable spending far less ($200k or less) on a mobile home.

I'm comfortable living in one of the units but not an adu. 

Why....well because most of us will look for deals in a specific region based on our comfort.

Depends on your comfort level. 

Just will need to convert dining rooms/basements into the last couple bedrooms to hit your target rent, but you can do that at the end of your time living in the home!

It's all about you and what you are comfortable in. 

But if you decide one day that you want to reduce down to 2 roommates having a floor plan with a separate entrance or something with a separate living room that you can minimize common spaces you may be able to live with that arangement more comfortably for longer.