I am interested a subject to deal, but there is something that I am confuse about.

You have to disclose that it won't be owner occupied but it's still conventional financing subject to fannie/freddie underwriting requirements (like a decent DTI)-- you'll pay a little more than you will for an owner occupied property but it still the cheapest financing for a non-owner occupied investment property (I thought these usually aren't callable loans if you haven't done something fraudulent).

Also, look into the subject-to strategy and lease options.

Noise is subjective, one person may not care, another may go crazy listening to it. 

Would it be smart to train him and have him educate his self on the subject?

Perhaps the buyers bought subject to, assuming the larger note?

I originally went at this situation with subject to financing in mind.

So I would imagine yours would fall into the C2-C3 category, subject to the appraiser's opinion and what information they can gather in the surrounding area.

People do that frequently - the property is listed well below market value, the buyer snatch it up over asking, and both parties see it as a win-win. 

She is a pro, much of her business is with investors and she does land trusts, llc's, subject to's, vacant, rehab etc.