One needs reservation to enjoy the evening as the place is quite small. Once you are inside, have a table... then the evening begins. One of the ladies approaches you with the menu. Don't expect a menu full of traditional Portuguese dishes, but rather list of cheese platters and canned fish... and of course several pages of local wines and port wines.
If you don't know what you prefer, the ladies will ask for your tastes, and they will give you 2-3 bottles of different wines to taste, so you can choose the type of wine you like. And so on...
We went there on our last evening in Lisbon and it was a perfect goodbye to Portugal.
Location is very good, wines are amazing and staff knows their wines. A must bar in Lisbon!