If you want a good place to stay right in the center of Havana, you should go to Lourdes' house (CASA LOURDES IN CENTRO HABANA). Not only is it cheap, but you will also get to enjoy the company of Emilia and Lourdes, who are very good people. You should also try their cuisine, for only 2 CUC you will get a meal that you won't ever forget.