My sister and I stayed at Beau de Beaubourg for 10 days in August and absolutely loved it... a few of our thoughts below:

Pros:
- AMAZING location - close to everything, great shopping in Le Marais, wonderful restaurants (Nolita Pizza and Mi Va Mi are both worth checking out for lunch or a low-key dinner), 5 min walk to Notre Dame, many metro stops very close by, one direct train ride (only 25 mins) from the airport
- Super cute apartment - very clean, spacious, bright
- Only 1 flight of stairs to walk up (you will appreciate this after a day of walking / biking around Paris :))
- Very comfy Queen size bed
- Apartment looks just as the pictures show
- Ludovic was incredibly quick at responding to our questions prior to arrival

Cons:
- Overlooks a busy street and over top of a bar so can get quite loud at night (although if you turn on the supplied fan, it helps to drown out the noise)
- Being new to airbnb, this may be typical and we understand that toiletries were not meant to be supplied, but we were surprised not to have any of what we feel are some essentials – hand soap in the bathroom, dishsoap in the kitchen, no more than 1 roll of toilet paper in the bathroom, paper towel - we needed to purchase all of these on our first day. The pro - there are a number of grocery stores close by to pick these things up!

Overall, we had a great experience and would highly recommend Beau de Beaubourg!