Just employ good management techniques, just don't be negligent, have insurance and relax!

If you feel you have the time to spend to chase down rent payments then all the power to you, but I find it much more relaxing and easier to have tenants who I do not have to chase $ down from them and pay on time

Being college students, we understood what he said but didn't think he was serious, so we held a small get together and had a great night (don't think of any crazy parties, think relaxed kickback).The next morning we got an eviction letter telling us to move out immediately.

Relax a little.

They won't be able to ever just relax, if they never know when you're coming and that window is a 12 hour window every day.So, make it a 2 hour window, and less if possible.  

If you are confident in your tenant you will relax more.

One bad tenant and you will realize that you were too relaxed.

I have questions about the validity of the Service Member/Sailor affidavit that you may have filed, but perhaps your jurisdiction has more relaxed standards about the due diligence requirements for who may speak to this.

Once you find one you can trust you can surely relax a bit as them having to get your approval for a small fix can hinder them.

Our normal policy is more relaxed: we do not assess a late fee until close of business on the 4th of the month and do not serve a notice to vacate until the 7th.