The Great Gatsby, cool bedrooms

I'd like to know if in the following excerpt from the chapter Eight of The Great Gatsby the word "cool" means "fairly cold" or "fashionable", "attractive":

There was a ripe mystery about it, a hint of bedrooms upstairs more beautiful and cool than other bedrooms, of gay and radiant activities taking place through its corridors and of romances that were not musty and laid away already in lavender but fresh and breathing and redolent of this year’s shining motor cars and of dances whose flowers were scarcely withered.

Thank you.