Id tell people they could enter, just dont expect too much, you'll get what you receive, and you'll probably be offended if you look deep enough.
The room itself would be one of those standard sized ones with the walls a dark emerald green, a ruby red floor, and a sapphire blue tile floor with a GO on a round shield with the birthstones in a clock face lay out (starting with the Garnet at the 12 spot) in the center. if you picked and peeled at the walls, youd see them flake off for an eye to stare at you. Over all the room would feel... cozy. Not too big where you feel like youre drowning in its ambiance, but not too small to where you feel confined and trapped.