The loft is very styly, bright, warm. Localisation is great, which is of value when you can't use public transport, as it happened during our stay due to the protest of public sector workers. We were able to walk to Eiffel Tower and back and it was still a pleasant walk.
All you need is there - even a very fast hairdryer, umbrellas, and a lot of guidebooks.
We were there in a group of four, but I think the loft is spacy enough for two couples and a baby or another fifth person. (If there are smaller babies or less sleeping-space demanding persons the third bed will be OK for them so the loft could house even 6 persons).
Raphael's manual, which you receive before arrival, is very handy - no problem with check-in and lack of a material key (only codes) is an advantage.
All things worked well.