However, the space is considered non habitable if the oven/ stove is removed and the gas line is capped. 

Should this issue be a partial responsibility for their absense while leaking and should we deduct some cost from them?

Water bills are up 50% to 100%, electric bills are up 33% and gas bills are up 30%, and of course tax bills are up and new bills for new items are created. 

This is pretty much how banks do things too - the idea is that not only do you have to afford your rent - but also your electric, your food, your car, your insurance, your gas, internet, etc.  

We removed 4 walks (including load baring), installed 2 walls, added half bath, replaced all plumbing and electrical, added new eye brow porch, painted full exterior (changed color), replaced all flooring, new bathroom and kitchen layout with everything replaced (shower, cabinets/vanity, counter, appliances, etc), stocked with new furniture, added mini split, removed gas/wood fireplace and added a new electrical fireplace, and placed initial STR tenant in 2 months and 1 week.  

I doubt their gas amounted to $1000 unless they live in the middle of nowhere and did multiple trips per day.  

A/C, hot tubs, leaks, appliances, etc.?   

It doesn't cover the cost of gas you put in your car to drive and see the property yourself.

I'm predicting Cleveland will return to what it has historically been: cheap houses for cheap prices filled by cheap renters.That and a $1.74 will get you a cup of gas station coffee.

I would check for water stains on the ceilings and leaks around the windows as well as soft spots on the floors.