Word to the wise - write the door code of your unit on your hand with sharpie. I'm a responsible person and nothing like this has ever happened to me before... but he has key code entry on multiple doors and I can't stress to you the importance of writing them down and keeping those with you at all times.
The night that I stayed there, I sat out on front porch to return some text messages while my little dogs chilled inside. My cell phone battery died - the codes to the doors were on my cell phone. As such, I was locked outside in my pajamas in a dangerous and scary late night time neighborhood. I had no way to reach him or anyone else. I had no way to find out door code that was on my dead cell phone. It wasn't safe to go walking anywhere for help. It was a really bad night; I was scared and left in a dangerous situation