The actual flat is as described and as many reviewers have already detailed. There is plenty of room and beds to accommodate a family and it is very clean. And yes, all the beds are lofts. This was different, but kind of fun. There is no real shower, just a bathtub with a very low ceiling and that has a removable shower head. We did not have any surprises with the accommodations in the flat. Isabelle was very kind, and easy to deal with.
However, the listing for this property describes it as being in Marais, which is misleading. Yes, it is close to the train, and a short walk to some great places, but the flat itself is not located in the best area. We came back to the flat around midnight a couple of times and we did not feel very safe. I don't think we would stay here again.