There's no greater or worse feeling Every time you see dust or REALLY ANYTHING of a small spec or a piece of your own hair tickle you And has you literally fully loaded with a flash light with new batteries(god forbid you run out of batteries). 

It is Tenant’s responsibility to test smoke and carbon monoxide detectors weekly and replace batteries when required.

I had used evernote a couple years ago and it would put a drain on my cell phone battery.

Lease options work best when the mortgage payments are low enough to allow you to charge rent + a premium.

They tend to pull out the batteries from smoke detectors for their personal devices.

You could be sitting there telling yourself, “Heck I'll just install CO detectors” but what happens when the tenant removes the battery and do you really want to trust a cheap gadget with wide operating tolerances that may or may not alert someone in time?

Circular SawChop SawTable SawCordless drill with 4 back up batteries and 2 charging stations-US bit set-Metric bit setHammerSledge HammerScrew Driver SetAnd then start buying specialty tools as you need them.

Pinning down a ROI before you buy is nothing more than an exercise that will not ever yield an accurate forecast.You can only guess at future performance, you can have an educated guess, but you'll never get as close as you might measuring performance of a bond or other securities.RE is unique, your experience and gut feelings need to be honed to your market rather than running the batteries down on your calculator, IMO.

Conclusion: This is a serious psychological issue you are dealing with, so set yourself up for success and charge rent or just pay out of pocket for the crew to clean. 

It's hard to determine what makes you tick before you identify where to insert the batteries ;)