We loved staying here and hope to visit again someday! Some highlights:
-the space was big and comfortable, with four proper rooms and another bed in a hallway. We had plenty of room for four adults and one child, and could have easily brought another adult or two kids.
-the noise insulation was impressive for an old building, with thick windows blocking the street noise (also nice to have the windows open to hear the bustle below), and very good noise insulation between rooms when the doors were closed
-comfy beds: one queen, one full, three twin (including the hallway), and a second bunk bed in one of the twin bedrooms
-nice water pressure, great to have a washer available
-four flights of stairs, to be expected in these older buildings, and worth the trade-off
-awesome location, easy walk to the Seine and Notre Dame and Louvre, or shopping in the Marais and to the canal
-some favorite nearby stops were Le Oken restaurant right downstairs, Aux Delices de Beaubourg bakery right around the corner, Centre Pompidou a block away for amazing art and view of the city and even a kids section open 11am-6pm (it's posted as 7pm but they really close around 6), and Fleux store a couple blocks down for all kinds of gifts to bring home.
We had everything we needed for a wonderful week-long vacation with three generations.