This is off the beaten track a little but easy to find with a good local map. About 15-20 minutes walk from Nevsky Prospekt. The museum depicts in great detail the 900 day blockade. When you go in there is very little written in English but once you go upstairs to the actual exhibit about half way along on the right is the first sign in English. Then just go round clockwise and there are commentaries in English every few feet.