In Portugal, "um café" will get you a standard black espresso with sugar on the side (just do not use it).
There are a lot of way to dress up the basic espresso, but few places serve the standard American drip coffee (or even French Pressed). About the closest you will get is to order a, "Café Americano" (yes, that's right). But now speciality coffee shops in answer to the recent invasion of Starbucks are opening up so you can get almost anything (even in English) in the bigger cities.
Unlike in the UK, milk is not automatically added to coffee in Portugal, though sugar is ever present (but it is left to you to put in to your taste).
I didn't try this, but The commander likes unsweetened coffee is probably the most apt translation for this.