Hi Mushy
Just going on what you have explained so far and without seeing the premises I would comments as follows.
On the issue of self closing devices...One train of thought is that guests will keep their bedroom doors shut when theyr'e occupied for privacy / security reasons. It is also assumed that they will lock their bedroom doors should they pop out and therefore self closers aren't required.
Thats said of course I personally feel that management should consider what may happen if a guest does leave their door open for whatever reason. Plus the HMG Sleeping Accomodation guide (and I realise it is just a guide) recommends that they are fitted. I personally prefer to see self closing devices fitted, however other officers / consultants etc may disagree and again its down to risk assessment.
The means of escape you describe, so long as travel distances, exit widths etc are built to take the numbers expected to use them, are well signed etc, doesn't sound too bad.
As you say if the accomodation stairs were unavailable during a fire and guests can turn their backs and use the other exit is there a problem?
External staircases if well managed and maintained are ok, they should be non slippy, appropriately lit, structurally sound, cleared of snow and leaves etc, protected from the elements blah blah blah As you say the metal grid may hamper someone wearing heels and that may be something that needs to be addressed.
Corridors with settees in them? strictly speaking escape routes should be kept sterile, but again is one settee a problem? does is obstruct MOE? is there any significant ignition sources nearby? are the setees in a dead end condition? Is there any evidence of illicit smoking in common areas? if the answer to those question is no then again I wouldn't be overly concerned.
It's hard to comment accurately without seeing the premises but based on what you have described that would be my initial response.