The 4th floor is very nice, but unless you have some "inside" info, you really won't know which room you've been assigned to until you arrive. The club level rooms encompasse the 3rd, 4th and 5th floor of the main building. The 4th floor does have the lounge and room views can be of the castle, courtyard or beach. Our favorite room on the 4th floor is 4404 (nice castle view). The rooms themselves are basically no different in setup than any standard GF room. Other than you'll find 2 bathrobes already in the closet, as opposed to having to call housekeeping and order them. Was there anything specific you'd like to know?
I could add that there is private check-in, that the club level CM's sit on the 3rd floor, there are 2 private balconies for club level use (unfortunately no fireworks view though). Also, food offerings are available daily in the lounge. Beginning at 6:30am, they put out coffee, tea and juices. From 7:00am - 11:00am, there is a deluxe continental spread with cereal, oatmeal, yogurt, fruit, muffins, breads. From 11:30am - 1:30pm, you can find snack items. Sometimes a light salad, hummus dips, nachos. From 2:00 - 4:00pm, is afternoon tea with cookies, brownies, strawberry trifle (select days), scones with devonshire creme. From 5:00 - 7:00pm, cheese & crackers, vegetable trays, a few appetizers, kid friendly items, wine & beer. From 8:00 - 10:00pm, trays of mini desserts, including chocolate covered strawberries, petite fours and cordials.