If you look for a nice coffee break during a walk at the river (Vistula) and some sunny terrace (if the weather allows) this is a good place to go.
Augusta is a small ship on the river with a fancy bar and restaurant, where you find some good quality coffee from Italy.
The service may not be the quickest but while you relax and observe the riverfront in the sun, probably you don't mind to much.
Coffee Index: 7 pln