After the sandwich talk to Robbi.
Reny will get a message from Stefan. Ask Robbi to help. Robbi will run upstairs.
This is the low-spoiler guide for "Get out of Reny's apartment" puzzle in Kapia. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.