The short answer is yes, it is included at the end of the email with their reservation confirmation. Unfortunately, this email is sent immediately and most guests forget that the instructions are there when they're getting ready for their (often a few weeks or days later).
Since I too get these questions, I've prepared a write up that I have saved on my computer and phone, so when a guest asks me how to get into my unit or where to meet, I just cut and copy into the message. I've also printed out the house manual and leave it inside my home, so a guest cannot claim they weren't aware of a rule.