Cris, and any others who may be interested. I used to live at the Barbican so know it well. There is a tube to the Barbican Station and it only has one exit. When you come out of the station, cross the road and go up the steps which are practically facing you, turn right and walk along the thoroughfare (there used to be, and may still be a yellow line marked in order to show visitors the way) which will take about five mins. Go down the steps at the other end. You will see an expanse of water to the right and the cinema, theatre and restaurants are to your left. It is not difficult to find. I hope that helps.