you were completely alone in your apartment, waiting for no one and peacefully drinking tea in the evening. Wonderful weather outside the window, stars, the moon is shining brightly, a cold breeze is shaking the branches..

You hear a soft knock on the front door. You got up from the table and went to see who was there. You open the door and see a tall guy in a yellow sweater and jeans, and next to him his two backpacks with things. The guy looks at you fearfully and nervously with his pale blue eyes

Looks like he's your roommate now

What are your next steps?