Lower your offer price and move on.  

For example, if I were to invest in Columbus, Ohio, could anyone share their insights on which neighborhoods or parts of the city offer good returns?

Too risky for us.Regarding additional guest packages, you can easily change your tax situation by offering what the IRS calls "significant services".

Account ClosedAdding your property manager as "additional insured" is standard practice and beneficial for you.

Are there any guidelines or best practices (ie: rewiring such a property would be more valuable than updating insulation).Is it something you need to ask the insurance company about to get, or is all this determined in the initial interview with the potential insurer?

If the inspection reveals a bigger problem, either you can try to keep the deal alive by offering a seller credit, which could motivate the buyer to move forward, or the buyer walks away. 

I only have one that seemed to fail to launch.What I do get more is I offer to run a newbie through a transaction and/or show them the work in progress and I get either no show or barely show. 

We were in Croatia for 8 days when we had the offer in and did not go to Croatia planning to buy an apartment.

Our primary property management partner oversees more than 200 of our clients' properties and offers MTR management at competitive rates (I do not receive any referrals btw).

That way, when you’re ready to make an offer, you'll be all set and confident to move fast.