Thanks for the help guys - I did survive and didn't get stuck in any horrible holes in Paris
Ended up going around the St Germain area. Got off at Odeon, and wondered around for quite a while. Took Knulpuk's advice of walking along Boulevard St Michel. As uncultural as this sounds, after a day long conference I just wanted to take in the atmosphere, do a bit of people watching, get a bite to eat and then have a drink or two.
This area did not disappoint. Although I did, controversially, decide to eat in a Teppanyaki restaurant - it was easily one of the best Teppanyaki meals I've eaten - food extremely fresh and I was really blown away by the attentive service (that's as much to do with me accepting the appalling Dutch service you'll find in Amsterdam!)
After dinner I wondered around looking for a good place for a drink or two. Again, this makes me a sound a little unsophisticated but there was a big Guiness sign sticking out. Now usually I would skip a pub and find a nice little winery but I was just interested in finding out how the Parisians "did" an Irish bar. The truth is I'm not too sure because when I walked in there were 2 guitarists playing ecoustic with an open mic for anyone to come up and sing. Fortunately, the people brave enough were fantastic and it made me thought that this is the kind of place that X Factor should really be filmed at!
So although I ordered a couple of Guinesses and ended up having a couple of "Dr Pepper" deathchargers with a couple of friendly French students I didn't really end up taking in the ambience of the actual pub. It was more like a student hangout but with kids who had the most amazing voices. Was also impressed that the house guitarists seemed to know every song being requested of them.