Are there rooms big enough for 2 adults and 2 children?
I don't know what all of the room configurations are. The one that we had would not accommodate more than 2 adults.
For a Paris city hotel the room s we had were quite large but I doubt they could fit two more beds. As all other commentators I can only confirm that the staff is excellent and recommend you contact them directly.
I think so- you just need to pay more money. I think there are 6 different categories of rooms. Hope this helps. It's very central.
I really can't answer that for you. There were families staying there while I was there so the rooms must be comfortable for them. Check with the hotel directly. They are very helpful.
In our experience the rooms are rather uniform in size. The rooms we rented would not be large enough for more than two people. It's a typical central city hotel. And the size of the rooms reflect that fact. I believe they have several larger rooms though I can not quote specifics. I can say the hotel is very well situated and may be worth the family contact to find if any room could be made to fit your needs
Get an answer from Hotel d'Orsay - Esprit de France staff and past guests.