Bet on 60 days to rent, if it happens quicker awesome, but 2 weeks in a sub-par  neighborhood isn't unreasonable.

There will be TONS of forum posts that discuss the different companies and our pros and cons. 

In addition, what things can I look for in an area (online, preferably) in order to estimate whether it is an A, B, C or D?.

Paul said, "Do not be misled: 'Bad company corrupts good character.'" (1 Cor 15:33).

However it is in your best interest as the owner to have a properly grounded electrical system installed and rewiring is probably your best bet on accomplishing that. 

Current Price of a 4 plex in my market: $150,000 for B/C+ or $85,000 for C-/D+Average rent per uint in my market for a 4plex: $600 for B/C or $450 for C-/D+ PITI: $1,100 for B/C+ or $750 for C-/D+Target Down Payment* $5,000 Closing Fees $3,000 Legal, Accounting, & Advertising Fund: $1,000 annual Maintenance** $3,000 annual Emergency Repair Reserve: $3,000 Management: Self Manage - - - - Projected Total start up cost for each Properties: $12,000 * 3.5% FHA for $150,000** based off FHA guide lines of 2% of the property value in annual maintenance2018 to 2019We hope to quickly save for a 2nd property with in one year.

Class C+ or higher apartments 2.

I don't use plan B, C, or D if a property doesn't fit my business model.

Bet on America!

So, one batch of money comes from C or C's lender and a second batch of money comes from the flash cash funder.