You need to be competitive in your local market so do your local homework Regarding appliances - you only need to be a hair better than your local competition.

On one property I purchased (owners had pets) I could see all the dirt/dust/dog hairs in some vents.

The bolts were tight, but I was able to push it a hair.

Metal plug would not go down tightly BECAUSE IT HAD SO MUCH HAIR WRAPPED AROUND IT IT COULD NOT FIT. 

Very hard to clean all the cat hair and dander after a cat owner has moved out.

That may well prove to be a more fruitful proposition than trying to sell a house with an uncooperative tenant, and dog hair.

Trust your hinky hairs.  

No place to set down the curling iron or hair dryer. 

Our landlord, on the other hand, never hears from us, we pay rent on time, and we keep her place clean and maintained nicely -- it actually looks way better now than it did when we moved in, because we've repaired crumbly wall sections, spackled holes/dents, touched up scratched doors and floorboards, de-stained the linoleum, replaced cracked lightswitch plates, power-washed the patio, washed the blinds (the landlord didn't, there was cat hair embedded in them from a previous tenant, which by the way the landlord wasn't aware of anyone having a cat, LOL), etc.  

I didn't rent to people who didn't respect me or value my time.And, I agree with roommates/couples you put them on the lease and then only do month to month agreements, because odds are, they will break up and you'll be dealing with this scenario.The only times I didn't include all adults on a rental agreement, I then gave written permission to the tenant to have a long-term guest, which could be revoked at any time.But, really trust your hinky hairs.