We spent a wonderful month at Gaia's place in Le Marais.
Gaia and her colleague Noel are very responsive and helpful.
The location is great- Less then 5 min walk to the metro, 3+ great supermarket options, cheese shop, meat market, wine shop...Everything you need is literally a few steps away.
The apartment was perfect for the two of us. The washer/dryer is a combo machine and came in handy. Dishwasher is brand new. The kitchen is stocked with all the basics. Bed was comfortable (couch is comfy to sleep on too)
The unit next door was under construction, so we did hear them sometimes but only during the week at reasonable hours- We were usually out touring around when they were working next door.
If you're looking for a cute little flat in the heart of the shopping district then this place is a great option!