Everyone has an opinion on the house, the lease, how much rent they should pay, what items to redline in the lease, etc.

I do not want to list all the items you mentioned but heck IMO there is much more to this story.

You can find videos/articles online on how to get the basement dry, but the basic process is: 1) turn off all electric to the basement (to avoid electrocution from the water), 2) run pumps to get the standing water out of the basement (sounds like you're already doing this)3) remove all furniture and items from the basement,4) once you've pumped out the standing water from the basement, rent a wet/dry carpet cleaner/extractor from home depot, and use it to extract as much water as possible from the carpets (they'll be much lighter and easier to move once you get the water out). 5) After you've used the carpet extractor to get most of the water out of the carpet, remove all carpet and get it out of the house for drying (if you're trying to salvage the carpets), or throw the carpet out.

Do your own maintenance items and reduce maintenance/cap ex costs.  

The other items you should request manually and review yourself.

Although, it is a good idea to ask your tenants to refrain from putting anything in the toilets with the exception of human waste and toilet paper because it is possible some tenant overloads their toilet with the wrong items.

It was a problem at my old home, the place he is currently renting, keeping the items there at the rental.

(i) Tenant is responsible for all damage caused by smoking including, but not limited to stains, burns, odors and removal ofdebris; (ii) Tenant acknowledges that in order to remove odor caused by smoking, Housing Provider may need to replacecarpet and drapes and paint the entire premises regardless of when these items were last cleaned, replaced or repainted.Such actions and other necessary steps will impact the return of any security deposit.B.

The more items you can check off the stronger your position to get the contracts.  

Whether you are starting an online service or buy a food truck, endless possibilities..