Even if you knew that you'd be brought into a private space, there's no way to actually prepare yourself for that. Jean looks around, taken back with the sudden change in the environment around him. He tries connecting to the network to confirm his suspicion. This is the thing that both Mikasa and Armin had already been through... even if the decoration is nothing like he heard.

"I guess with every set of hosts, the room changes the way it looks." It makes sense, considering how different the Arcana are.

The scent of the roses is quite pleasant, he notices. Jean likes the spiciness they have. Though what makes him actually curious is the pink fizzy liquid. It's nothing he's seen before. At least he can examine that until the meeting starts.