And, if you are upgraded to the executive floor lounge access is only available for you and one additional guest.
From hiltonhonors.com:
Executive Floor Lounges are available only at select properties.
•If you are a Gold HHonors guest, you and up to one additional registered guest in the same room will be granted complimentary access to the Executive Floor Lounge only if you receive a room upgrade to the Executive Floor or an upgrade to a room type that confers Executive Floor Lounge access benefits.
Upgrades will be given only for one room for the member, regardless of additional rooms the member may have purchased at or after the time of booking.