If you are staying at the Hotel Nacional in Havana, pay the extra 30 USD per night for a room on the Executive Floor. A few perks, and a separate breakfast room; the rooms seem bigger than on the other floor, too.
Hotel Nacional de Cuba, Calle 21 y O, Vedado, Plaza, Ciudad de la Habana 10400;
tel: (53-7) 33 3564 al 67. www.hotelnacionaldecuba.com