This flat is genuinely charming, characterful and light. It has plenty of space (there were 3 of us, but you could easily have 5 people sleep there - there are two good-sized double beds and a single). It's quiet and secluded from the busy streets.
The kitchen has all the things you would expect to find in a regular home, so if you're trying to save your cents, you're well-set for home cooking options here.
There is one standalone bedroom, with double bed in it. There are two beds in the lounge area (one is a full-time bed, the other works very well as a sofa bed). All were very comfortable and everyone had a good nights sleep. Although there is one standalone bedroom, in order to get to the bathroom from anywhere in the flat, it's necessary to walk through that standalone bedroom. However, I believe that's mentioned in the description, and it's really not a problem anyway (for us at least).
The flat is on the 2nd floor, up some lovely old wooden stairs. My Dad was one of our group and he's 90 years old, but the stairs were not a problem.
The location is superb for the Metro, which we used frequently. Rambuteau Metro station is genuinely 1-2 mins walk. However, you can easily walk to Notre Dame itself in 15 mins at a fairly leisurely pace. If you're after your fix of art, Pompidou is 2 mins walk. A "City" supermarket is 2 mins walk away too, and has pretty much everything you'd expect from a city supermarket chain. The area is also excellent for restaurants. Also feels very safe.
Liliana (the cleaner) is a super lovely lady. She greeted us when we arrived, and you couldn't wish to meet a more lovely and cheerful person.
Very many thanks Eve :-)