When you are comfortable busing around Paris you can easily get to and hang out in locations you can’t afford to stay in “:-}”, such as the totally delightful Rue de Buci neighborhood in the 6th arrondissement. Paris bus line 63 once again will get you right there when you’re traveling eastward. The Rue de Buci stop is aptly named Seine-Buci. You could also st/roll over from Brasserie Lipp (or Café de Flore or Deux Magots,–the three establishments being conveniently located in virtually the same place!).
If you are st/rolling up from Brasserie Lipp rather than busing, I recommend turning left at Eglise St. Germain and taking the Rue de l’Abbaye to Rue de Buci. The neighborhood is roller friendly and full of a multitude of colorful market products all around you. This neighborhood makes you want to set up housekeeping. Allons-y!