I stayed there four days.
The common area is old but William’s room is clean, very well equipped and airy. It faces an inner court with nearly no noise except if other neighbors open their windows and have some party. (It was the case for me the first night.)
Centrally located. A few supermarkets and bakeries around the corner. I recommend Boulangerie Bo on bis rue de Clarenton 250 meters away. Amazing breads and pastries and decor. Some tables to sit outside and stools inside.
The property is easy to reach by metro and bus. Safe to walk around at night. I didn’t find it scary to walk around as a female solo traveler.
A Nespresso coffee maker is a big plus (you can buy capsules from nearby Monoprix or Carrefour) and a selection of Kusmi tea. There are both little oven and microwave. Plus a washing machine. Which is good for long term stay.
Shower cabin is new and body soap was provided. Bathroom has a heating unit.
You have to draw in and out the sofa bed each night to make space for moving around.
All in all, William put great attention to make this cozy place a joy to stay in. Well done.