But it turned out, it was his roommate (who moved in without telling me, but turned out to be a good tenant) that was doing the cleaning up.

Another thing is if you have black mold and you gut the property make sure you clean the air as well as you will still test positive for black mold, the spores can be floating around in the air still even if everything was removed! 

There have been times when (left in such good condition and clean)  I've refunded when they left early.

Have you looked into the Turn Key Method?

Small roof repairs are usually fine to do, but ... the foundation should be corrected and settled back in place (usually 1-3months, depending on the method and what was done) before the roof is replaced, or you'll void all warranties that the roof had!

If major foundation work, you should wait 1-3 months to do the full roof replacement (depending on the method and how much was done).Example: If/when we do a full residential roof replacement, if major foundation work is done after that, any/all warranties are void!

Method of choice was looking for potential properties online using redfin then when I had run simple numbers I would drive by each property and its neighborhood and if it was worth pursuing, I would schedule to see the property through the selling agent.

(boyfriends/girlfriends/family, etc)7) Who cleans?

I am assuming in this that normal cleaning was done pre-occupancy and they are excessive in their expectations.

Purchase price: $160,000 Cash invested: $45,000 Ended up buying the property after getting to know the owners who were cleaning up when I went over to ask them permission to cut down the leaning branches toward their roof.