Central to Gdansk this is a lovely street, full of restaurants (not chains-Subway excepted) and bars. The architecture belies the fact that WWII kicked off here. It never seems to be quiet and, whilst quiet in Winter, has a fantasic cafe-culture in warmer months. What makes it even nicer is the dearth of litter that so often plagues many city centres, helped no doubt by the litter bins every 10 metres.
Even if you are not hungry or thirsty you should make the effort to walk the 'Long Street'