Well... it turned out that the "mysterious dungeon" in my flat. Isn't actually part of my flat but my neighbours apartment. I never met him before. We had a chat for a little while. He's a Half-Ork/ Half-Jinn who is into Dungeon-Larp: That's why he set the traps. The bottle is actually the place where he lives in.
I feel really bad for breaking into his space while he was shopping for groceries. To make up for the trouble we made we invited him for dinner next week...