 Sound isolation was very poor Every time someone passed through the corridors you could hear it you could even hear what they are talking about Furthermore I have been lucky with some neighbors who decided that it is a good idea to shout at each other at 2 a m add to that the wonderful sound isolation of the rooms and you have got an unforgettable night in Paris P S No real windows were present either I mean there was one looking into a square inner yard 1 5x1 5m and you could easily look into the neighboring rooms 
No Positive