#selector {
    polygon-fill: ramp([room_type], cartocolor(Bold), category(4));
}
/*
Expected output:

#selector {
    polygon-fill: #E73F74;
    [ room_type = "Private Room" ] {
        polygon-fill: #7F3C8D
    }
    [ room_type = "Entire House" ] {
        polygon-fill: #11A579
    }
    [ room_type = "Other" ] {
        polygon-fill: #3969AC
    }
    [ room_type = "Complete floor" ] {
        polygon-fill: #F2B701
    }
}
*/