I would not allow it.When I was a manager, we did really quick inspections every 6 months, checked the smoke detectors, quick check to see if there are leaks under sinks, mold in shower, if a/c unit was leaking inside, asked tenant if there were any issues, and off to the next one.  

If they put the cell phone near the sink and it got wet from them using the sink, woudl you pay for that ?  

After they were gone, and the place cleaned out, took 3 months, roaches totally disappeared, the rental unit and adjoining units.The chief reason we found with these tenants is they leave dirty dishes in the sink, don't wipe off tables after they eat etc.

Ive shared one large bathroom, 3 sinks 2 toilets 2 showers, with 16 other men for months at a time while I was on a military ship. 

For the pink one, change the toilet and sink. 

I think Brandon's plan of rent deferment via future rent increase is going to be like trying to plug a sinking ship with lots of holes with too few fingers.

The drain to the sink was completely clogged.

The laundry would then go where the hallway used to be (the now extended part of the bathroom) and shares a wall with the kitchen sink (water access). 

Other small things while turning over a unit is; new toilet seats, new lighting in bathroom, new handles on all doors, new fixtures on sinks, ceiling fans in all bedrooms, supply a washer & dryer in my duplexes, and clean up the entrance area for a good first impression. 

Tell them it sucks, you had to sink money into a furnace due to the issue so you feel their pain...