From what I have gathered it's just not a good state to do it in but your mileage may vary.

Walls Remove/treat mildew (per surface) $15.00 Repair hole in wall $55.00 Repaint (per wall/ceiling) $40.00 Doors Replace door (interior) $165.00 Replace door (exterior) $485.00 Replace weather stripping $25.00 Electrical Replace light bulb $3.00 Replace light fixture globe $20.00 Replace light fixture $65.00 Replace electrical outlet/switch $15.00 Replace electrical cover plate $2.00 Actual charges may vary based on condition, vendor and/or cost of materials.

If the website is full of text without any social proof and 2 pictures, sure it's a bad example.Lumping everyone into one category and saying all SEOs and marketing experts get it wrong is, of course, your opinion, but I would agree most marketers in the real estate industry do not have the proper knowledge to execute an SEO campaign correctly.Cheers to your success and wish you the best.

Categories include: personal references, employers, and landlords?

Insurance will vary by location. 

Now when we have a contract out, they buy first and ask questions later :DNow for every category of buyers you need to have this equation.

I first would like to point out that the A,B,C,D categories are just good rules of thumb, but very much vary based on what each individual investor feels constitutes each class. 

Material costs vary minimally between cheap areas and expensive areas.  

Many jurisdictions have a "Holdover" element, that you can invoke if someone stays beyond their scheduled date (the actual process may vary).

I open up a credit card specific to the property and put all expenses that I can on that.Use an excel spreadsheet to teach expenses, there are plenty of templates around online, you can look for one you like to work with and modify it for your needs and to match IRS expense categories.