They have an app that you can run comps on, play with rehab budgets, do ARV calculations as you drive for dollars and apply for the loan on the spot.

After the first go for one with a light rehab.   

What acquisition prices and rehab costs are you targeting?

You'll need good contact info for them to be able to collect, and ideally the new address for the tenant however which if you don't have can probably be found easily with some online sleuthing/ contacting their employer, skip tracing software, etc. 

Although I'm confident I can fix and flip it, my plan is to keep it as a rental.My dilemma is... where do I get the rehab funds? 

Start small with simple rehab projects like painting or landscaping to boost value without overextending.

Does their ID address match their last rental?

sometimes to reduce borrowing costs, I'll use a hard money loan solely for the purchase, and then pay for the rehab in cash or use a 0% credit card (I don't recommend that for new investors!)

No email contact address and no one available over the holiday weekend.   

Also, I plan to put 20% down...rather than 25%...which will allow me to keep cash on hand to complete the needed rehab.