As others have mentioned, the space is small, but it all works and is excellent value. Punch in the access code for the main entry door and then slide down the small plastic panel on the lock box to the apartment to reveal the combination lock, dial in the numbers (I had to use my phone camera to make the digits clear!) then press the button to spring open the lock box to access the keys, one for main door, one for apartment. To lock the door when inside you need to press in the peg underneath the sliding bolt. Make sure you use the WIFI password as supplied by Patricia on the joining instructions as it is different to that given on the welcome message within the apartment.