Never, never interfere with the flow of income, one thing you will give your tenants the wrong message, and due to the laws of nature it is likely to come back and bite you in the rear.

I learned the hard way that any applicant who starts asking for changes before they are even approved will ALWAYS be a major, major pain in your rear until the day you get down on your knees and thank the universe that they are finally out of your life.In fact, if you just put in your written tenant screening criteria that you reject anyone who asks for changes or upgrades, then you can deny them just on that - as long as you are consistent about that with all applicants. 

That's just to cover your rear in case anyone files a complaint against you for discrimination, which I can tell you is so rare it never happened to me over many years and hundreds of applicants. 

Boilers are a pain in the rear. 

Getting rid of a paying tenants who are a pain in the rear is not worth it.

I wouldn't deal with any that turn into giant pains in the rear. 

And obviously, you have more love in your heart for the tenants who just pay every month without needing a reminder.But, a funny thing I learned, is that just because a tenant always pays on time, that doesn't mean that they aren't actually one of the biggest pains in your rear on other issues.As people have mentioned time and time again.  

That bare spot is not normal wear and rear.

A pain in the rear. 

A few pics of the basement5. a few pics of the front, sides and rear of exterior.