In that time I never was in his apartment for a service call, noise complaint or anything. 

The main things have been a tenant not realizing that you can't pour bacon grease into the drain even with a garbage disposal (this is actually in the lease), noise complaints (though half of these have been against nonstudents), parking issues, and seeming to forget when trash day is.  

It's a power trip.Then, after the shower head was installed, she said she wanted us to have some other tenants across a small breezeway from her, stop using their air conditioner because the noise bothered her.  

I was able to take care of the noise problem then.On the other hand, maybe their complaint isn't reasonable.  

Include the CCR in your lease and have the tenant sign that if fines are incured due to the tenant behavior, the tenant will be in breach of the lease.99% of the time the tenant is doing one of a few things: parking in a red zone, having loud parties, bringing to many guests to the pool, unsightly belongings visible, unsupervised pets, not leashed, defacate in the common area, unsupervised children (that make noise and break stuff), speeding in the deiveway, bringing food, glass, beer or marijuana (legal in CO but not CA) into the pool area, indecent or illegal activities in the common area.I've seen it all.

Probably doesn't have a lot of choice of where to live so he deals with the noise by being gone all the time. 

Tenants also hate noise, and a new tenant might not be so accommodating with you banging around and using power tools, etc., as your current renter has been.Then, when you move out, you rent that unit at highest market rent you can, and raise your old tenant's rent after her year lease is up, maybe keeping it just a skotch under market, to keep her, if she's still worth keeping.

James DeRoest what about those tenants who have a good credit and no evictions but are the ones who don't take care of the rental and who other renters always complain about noise or other issues.

Even if your college guys don't cause noise problems with the neighbors, they will probably want to change roommates fairly often.  

The owner was very against renting to students, because of the noise problems, etc.