I believe the Monoprix you're talking about is at 50, rue de Rennes. I love Monoprix too... it's a great place to buy bottled water, chocolate, shampoo, cheese, etc. When we needed an inexpensive bag to carry home souvenirs, we found one there. It's like a Super Walmart, but a bit smaller, with the grocery department downstairs and clothing upstairs. I appreciated that there was an escalator down to the grocery department.

Best regards, Sandy in Illinois