I used to commute from denver to anaheim for work and would stay at the Hilton approximately 2 - 3 weeks per month.
the room sizes on the exec level are the same as the other floors of the hotel, the 'perks' are turn down service, water in the room, continental breakfast, free pop/water/coffee/hot chocolate, etc in the lounge, hot appetizers as well as fruit and great cookies all day long. The team that works the executive lounge is extremely friendly and will do what they can to make your stay a great one.
A roll away bed would fit in the room if you moved furniture, however you would want them to know about it ahead of time. They do charge for the roll away and will not put it in a room if fire codes become an issue. One option for a slightly larger room is to request a room on the 5th floor that overlooks the park. These also come with a balcony so you could sit outside at night.
To get a larger room, you can request at check-in if any of the corner rooms are available - they are a bit larger and give you some moving space.
If you do stay on the exec level, tell Clint that GoofyDiane says hello!
Have a great stay.