I rarely write reviews, but felt this experience should be shared. No one answered phone at 10:30 pm for airport shuttle for multiple attempts, despite reporting that shuttle runs until 11:00pm. No one answered phone at front desk. Took shuttle for Doubletree hotel and walked, only to find that this Holiday Inn Airport was a different hotel (there are 2 separate Holiday Inn SLC Airport FYI). Ultimately had to Uber to hotel around 11:15pm. I can take blame for that, but still think hotel should answer phone. Overnight, at 1am someone entered my room with a key that opened the door. Thankfully, latch was secured. Person attempted multiple times before I called out that room was occupied and they left. I got up and secured deadbolt and tried to sleep again. 30 min later, someone again opened my door with a key that worked. Door was stopped again with latch, the deadbolt did nothing. This time I went to door. It was the front desk agent who checked me in. He states that they got the "numbers jumbled" and he was trying to sort it out knocking on doors. However, he did not knock only accessed my room with a key. I was traveling alone and scared by this point. I wanted to hang a "do not disturb" sign, but I didn't have one in the room. I requested one from desk, and they he me he would place it but he never did despite 2 reminders. In the morning after breakfast, my own room key did not work to enter my room and I had to get new keys. They didn't even ask for my ID, just gave me new keys for the room number I requested. I was afraid to leave valuables in my room when I was away during the day given multiple attempts by people to enter my room overnight and lack of security. There was no safe. Therefore, I carried my computer around with me during the day for a job interview, which was awkward. I tried to request to speak with manager 3 times at different times of day (morning 0800, afternoon 1600, evening 1900), she was never there reportedly. I was told to leave a message on a notepad, which I did, describing my concerns. She never contacted me. This was one of the worst and scariest hotel experiences I have ever had. Please investigate these issues, management.