The map has quite a roomy feel and Zombies are attacking you before you have even had a chance to pick up any weapons.
There are a couple of different paths that you can take to the safe house and on normal setting the map is quite easy to complete.
The map plays nice and my only complaint so far is with some of the stairs where you can easily miss the next flight down and go past where you want to be going ...
The only known bug so far is that ladders don't work.
The map can be played in Co-op and Versus modes, but obviously Prisonyard will not load once you compete the map.
To play, first download the map from here: http://www.l4dmaps.com/download.php?file=33
Extract the files and copy them to: C:\Program Files\Steam\steamapps\common\left 4 dead\left4dead\maps
open the Console and type:
I am looking forward to playing the completed campaign when it comes out ...