St Germain is very Glamourous and FULL of art galleries -selling ones, that is, so you need your biggest fattest bankcard! There are some very iconic cafe's and bistrots there and it's a bit like walking around in literary history, really. Not the most economical area in Paris but very much worth a visit, of course, even just for flaneuring purposes. It runs down to the Seine and is linked to Right Bank by several bridges as well as Metro or boat links.