If it's an MLS listing, it will be handled through the agent.I think the best way is through a multi-pronged approach. 

I’m curious as to how other hosts would handle this guest?

Inquire about home many they have, ask how they do maintenance, fees, hourly rates, how they handle late fees, have your attorney read their msa (master service agreement) and understand the more bells and whistles they have to pay for, the smaller your returns.

I've had many flooded rentals over the years and they're usually handled in weeks, not months.

I would love to get some suggestions about how to handle the situation I ran into. 

The Partner would be putting in 100% of the funds for purchase and rehab (around 50k total) and we would be handling EVERYTHING else.

Let them handle the tenant. 

So now that my back is against the wall, here we are. 7. 100%, and I tried to handle it that way. 

It is also good to ask the HOA how they handle big ticket items (roof, etc...) sometimes they will charge an additional amount for replacing these.Maintenance will generally be less since you don't have to worry about the exterior (usually) and any landscaping.

The way they handle things do hold some expenses down which is why I picked them.