I am sorry to hear about the major inconvenience that you had. I apologise for causing you to use up your time waiting at the door for that period of time and you having to look for other means of staying in Edinburgh. I have checked the messages between my colleague in the airbnb app, it seem that he had messaged you before you arrived to the flat and sent you the link to the instructions on how to get in as well as the pin for the key safe. It was the last few messages before you were going to arrive. Unless those messages weren't received by your phone we had assumed that you received the directions. Again we apologise for the inconvenience, please don't hesitate to contact me for any further information or queries.