Sewage had backed up and caused gallons of "**** water" to come up from the toilet.

Ditto to everything said so far, I’m starting out myself and have a SFH and I’m interested in hearing how this pans out.

I did all of the demo myself immediately after buying, and I lived in a construction zone for an entire year (one working toilet, no stove, no fridge, no flooring, no furniture, no cable, no TV, no internet).

Also, never take a photo through a screen.Bathrooms:  remove all personal property, close the toilet, open the shower curtain so they can see what type of faucet and general condition of the tub/enclosure/walls.Stage the interior by removing clutter, take the magnets off refrig, etc. 

Otherwise, the only general advice I can give you is...Check for toilet paper before sitting down.

Install new tile and decorative backsplash in both bathrooms (2ndfloor and basement) install new toilets (2) and two new 24-inch vanities with faucets.

Having labeled and easy-to-identify shutoff valves is a must.Train tenants to operate the shutoff valves at each of their fixtures (under the sink, behind the toilet, etc).

I prefer getting there 20 minutes early to set the thermostat to a comfortable temp, turn all the lights on, pick up any trash in the yard, sweep the front step, kill the spider on the counter, fix the running toilet, take care of any strange odors, ask the neighbor to stop smoking weed/shut their dogs/kids up/ stop screaming at each other, etc. 

Paper Towels (two rolls) ($2-$3 bucks)Toilet Paper (4 pack) (for when moving people forget the basics during a move)Hand Soap ($1.79 I think)Dish Soap ($2.00 or less Dawn)I spent maybe $60 on all of it max.

You never know how a strategy will pan out until you try it; if you find the path you thought was best for you turns out to not quite work out, try something else.