I'm also irritated that she was paying for rental insurance for her junk while she was always struggling to pay her rent!

It is about making the experience better for users so they don't get irritated by irrelevant ads or content they see all the time. 

On an empty unit you're just dealing with carrying costs - with an occupied one, you'll have justifiably irritated tenants.Good luck!

Smoking inside my rental can irritate neighbors, be a danger to children, or cause damage to the rental.2.

But there's constant police car sirens noise every single day at night (throughout the night) that it's impacting my sleep and making me irritated and depressed. 

If I were a tenant in this situation, I would be very irritated if I were approached about losing my job by somebody that I have not told directly or I didn't put it out there for the world to see (i.e. social media). 

They pay on time but they are very irritable and difficult to deal with.

It's something that irritates me because I always have to follow-up on collecting, payer's have to write them out and mail them, there's always delay at the post office, checks can bounce, excuses made, etc.

Their closed API and arrogance is really irritating.  

The scope of your project will dictate the sophistication needed from any template or program.Might study what goes into computing IRR, it's not very useful on a pro forma basis.....to much guessing involved. :)