If you will be picking up your keys at Berzelius väg 3 during the summer you should be aware of that the BZ-building has limited opening hours during the summer.
For information about the opening hours of the BZ-building, please see the website of KI. With a KI pass card that students and staff use, you can enter the building Monday-Sunday 07.00-22.00. On red holidays the building is closed for everyone. Should you not be able to pick up the keys yourself, you might want to ask a friend or colleague for help.