UGH, the life of a landlord

Well I guess I should be grateful that I have had a somewhat smooth run with our 2-family house after the nightmarish 2008 we had, and I am. Unfortunately, things are now doing a slow burn between our 2 tenants with little ol' me being put in the middle. I can't not get involved as
the downstairs guy is blasting his music and speakers on his bigscreen TV so loud that my
upstairs gal can't hear herself think and her dog is cowering in the corner. Considering the dude works for the National Hockey League doing the jumbotron stuff, I guess he's got a pretty substantial audio-visual system hooked up there. It's a breach of his lease though to cause a noise disturbance to tenants or neighbors and I would hate to lose the best tenant we have ever had(the upstairs gal) because of this pompous whacko. The sad part is he keeps the place ridiculously clean(a sure sign of psychosis) and although it's always a few days late, he pays the rent. But he is a real jerk and we are thinking of not renewing his lease in Dec. There comes a time when you realize you don't want to be putting a roof over someone's head when they are that much of a heel. Hopefully he will leave quietly and we can find a good renter but it's really hard nowadays. Many folks looking now have lost other places for financial reasons in this awful economy we have had for so long and if I had any idea there were very few honest people left in these parts, I never would have gotten back in the landlord biz.
People look you right in the eye and lie like the devil
and then the truth comes out after they move in. I hate the thought of selling this place now.
The market is down and although we would get our equity out of it, I don't think we would even break even profit-wise but sometimes what this stress does to
our quaility of life and my already high blood pressure is hardly worth it. I have learned not to take tenant issues personally. We have never had a tenant leave our apartments by choice and
they have never had problems with us. They have either had job losses, relocations, or whatever but I have learned that when people are forced to move out of a place they love because they fell on hard times or were forced into a job relocation, they take it out on whoever is around and a few times, that has been us. People always seem to need someone to take their anger out on. On one hand, I don't feel like letting idjits like this ruin my financial plan but on the other, our life has changed and living for that far in the future when this house will be making us money or financing our retirement seems not to be in line with our need to live life now.
So I'll take it one day at a time. If he doesn't improve, we'll toss him. I'd rather carry that part of
the mortgage than put up with him. In his snotty e-mail today, it seems he was banking on the fact that I would not want to risk losing him 'cause his rent is the higher one making him the more valuable tenant. Basically told me that I should be doing everything I can to keep HIM happy. I assured him that he was mistaken about him being the more valuable tenant. The ego on this guy is just huge. He really thinks he's "all that". Advice of the day for what it's worth: don't buy rental property!!!! Note to self: start listening to your own advice.