When I arrived just after 5:00 PM to check-in to my rental, since this was an apartment complex, there was no one on site to identify for me which apartment I was to stay in. I noticed there were two doors with the appropriate locks on them, so I tried the key code I was given on both doors, but it didn't work. Luckily I was able to contact a resident in the apt complex who gave me the number of the property management company. When I called, they were closed. According to their recorded phone greeting, they had closed at 5:00 PM, but as a result of the phone message I left, someone was notified and did come to the parking lot and let me in to my rental. She told me she had decided to change the key code after I had made my reservation. Unfortunately, she changed the code after I had printed up my rental materials! I told her the issue was exacerbated because the phone number of the management company wasn't given in the rental materials I printed up, only a LINK to it. So that meant I had no phone number to call if I ran into trouble checking in. I hadn't noticed this number wasn't listed when I printed up my rental materials. So checking in was a complete nightmare. I did enjoy my stay once I was able to get in.
I would suggest that key codes not be changed until the next person rents the property (!) and that the phone number to the property management company be available in rental materials not as a link, but as the actual phone number to call!