Also, I wanted to hear their conversations to learn things about why they were looking for a place to rent, do they fight with each other, do they smell like smoke or pot, did they bring friends with them who are people I wouldn't want hanging around on my property, on and on.I know some people think having an open house generates a type of bidding frenzy, but you're still going to have to screen them.  

As well, as get rid of problem tenants without having to evict for breach of contract, and prove that.One type of smoke that you may not be able to anticipate is pot smoke.  

The other side and a 3 plug insert they added and they plugged in a microwave, coffee pot and a mixer. 

Nothing major - a fun-colored pot, dish towels, a bowl of colorful fruit and flowers in the kitchen; a shower curtain and towels in the bathroom; etc.

Maybe see if they will leave voluntarily.

It is like having a bunch of strangers having the power to interfere with your investment.And then there are the board members who decide it's their mission in life to harass owners/tenants about every weird thing, like potted plants on the balcony or whatever.I only bought the one condo, intending to keep it forever and rent it out.  

Secret pot garden in the closet maybe?  

I think people just like to skim over that part and focus on the pot of gold at the end.

I'd get a black one, then all the appliances are black.If you could change out the sink for one that's a single sink with a new faucet like the one in the picture linked below, it would make it look a lot more modern and I love the new ones - it's so much easier to wash a huge stock pot. 

Tell them that you are concerned because the trash is not disposed of, but placed on the property in a manner that the children can get into it and that there is so much pot smoking in the unit that it is very noticeable.