Map of Alfama, Lisbon
Alfama is a medieval maze of streets, so even with the best map you'll find yourself a little lost. But it's actually a very small neighborhood, so all you need to know is that if you continue going down the hill you'll reach the waterfront, and going up takes you to the castle, where you can follow the tram tracks down to Baixa (downtown).
The neighborhood starts by the cathedral ("Sé de Lisboa") and extends to the National Pantheon ("Panteão Nacional"). The best way to explore it is actually without a map, and just wandering around, discovering charming tile panels on the façades, unexpected views and picturesque corners. In between are whitewashed churches and places to have a drink or meal. Still, if you feel more comfortable with the help of a map, take a look at a closeup view of the neighborhood from Google Maps. You can use the "+" and "-" controls to zoom in and out: