This will be safe for unicode(s):

s = s.decode('utf-8')

EDIT. Looks like your string is encoded in such a way that “ (LEFT DOUBLE QUOTATION MARK) becomes \x93 and ” (RIGHT DOUBLE QUOTATION MARK) becomes \x94. There is a number of codepages with such a mapping, CP1250 is one of them, so you may use this:

s = s.decode('cp1250')

For all the codepages which map “ to \x93 see here (all of them also map ” to \x94, which can be verified here).