So I realize this is an old thread, but I'm not satisfied with the answers here.
Yes, theoretically you use "gostaria" (Condicional) to say you "would like" and "gostava" (Pretérito Imperfeito do Indicativo) to say you "used to like". However, in truth no one really uses the Condicional form nowadays in Portugal, specially not when speaking. Instead we use the Pretérito Imperfeito in almost situation you should actually use the Condicional.
I would like to go out today for coffee. - Eu gostava de ir tomar café hoje. -> not "gostaria de"
I would like a beer, please. - Eu queria uma cerveja, por favor. -> not "quereria"
I hope this helps. :)