Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

I have a no pet policy. 

Sometimes they add a pet under the radar, etc.

If your only raising rents 3-5% then a small lifestyle change on your tenants part (cable, pets, vices) could likely account for the increase. 

My rental property manager leased an apartment to a lady who at the time had no pets. 

It includes provisions like:One person per room.One car per tenant.Very limited overnight visitors.No partying whatsoever.No smoking or drugs whatsoever.No pets.

Smokers and pet lovers will pay extra for this freedom.

People Always need a place to live.The corner grocery store might close down and burn the NNN lease holder after all of the other supporting businesses attached to it go dark.BUTPeople Always need a place to live.In the last bubble aftermath I noticed many families grouping together, ie (SFH) brother and his family living in the garage, and/or sister and her family living in a camper in the driveway, kids galore, pets a plenty.

If the partner does not know what your likes, dislikes and pet peeves are then it makes it more difficult on the relationship. 

This may very well be the first story of many of why they can't pay their rent on time - bank issue, health issue, pet issue, etc, etc, etc.