I briefly visited Algiers in 1978 (just long enough to change money and eat a meal) after travelling by train from Tunis. Afterwards continuing to Oran (superb railway station) for six days, then on to the end of the line near Oujda, then a month in Morocco: Oujda to Fez, Casablanca & Marrakesh, later return from Casablanca to Tangier, changing trains somewhere in between. I found the Algerian people were among the frendliest and helpful that I've met anywhere.