Cash flow would likely be a little higher and more marketable for a multi if prospective tenants feel like they have somewhere that’s their own, instead of just living in a room in someone else’s home.

If the bathroom was with permit and someone permitted the sewer connection (they would have to) then they surely didn't check it. 

Of course by then I or someone else not living in outer space has already purchased, repositioned and resold the subject property.

There was  no internet for me it was Years of being in the business to learn these not well known techniques and concepts.

Someone with some good experience, I would anticipate 10-12% interest only for 6-12 months with varying degrees of lending to ARV.

For the property analysis and decisions I would chat with someone like @Denver McClure.  

I'm trying to decide which area would be the best for someone just starting out.

I set it up so that groups by tax categories and by property so it is a snap cone tax season.I have a seperate rent roll spreadsheet that has a tab for each property and one tab that has a running number on each property on this one page.I have customized this for my use and what my CPA needs over the years.So this is not something I would share but would be easy for someone to Google xx excel template and find a good starting point like I did years ago.

Someone approached me wanting to rent out an RV lot.

Everything is negotiable, you can place an offer contingent on the seller delivering the property vacant and you're (1) unlikely to get the offer accepted and (2) not going to find someone who will do that.