I stayed in the Marais on my first romantic trip to Paris, with an ex who seemed nice at the time but turned out to be obsessive and a bit of a druggie (in my defense, I had dumped him long before the latter came to light). But it was very much a penniless, walk around Paris because we can't afford to take the Metro or go in any museums, trip.
Mr. Spouse and I went back for New Year a couple of years ago, and it was nice to reclaim the concept of the Marais. I have to say, I didn't really recognise much of it, either because we didn't do as much walking, or because it's changed, or more probably because we went to a completely different part. I just hope I've actually chosen a Marais image!