Fun restaurant in Barrio Alto, Lisbon
There are tons of options in the Bairro Alto in all price ranges so here are some options:
Sinal Vermelho - Moderate, unpretentious, good regional cuisine and wine
O Caracol - Traditional fare with a good wine list
Primeiro de Maio - Traditional and festive atmosphere
RESpublica - Excellent food in the Centro Cultural 25 de Abril. Very affordable.
Império dos Sentidos - Portuguese and Italian Cuisine
Príncipe do Calhariz - Simple, rustic fare
Tavares - very chic and upscale
Pap'Açorda - traditional and rustic cuisine
Fidalgo - traditional and rustic
Let me know if you have any questions since I live here in Lisboa.