Accommodations for 5 in Paris

Impossible to make any meaningful recommendation without a budget window in euros.

You are unlikely to find a room for 5 in Paris; the Marignon hotel in the 5th has one family room, but it is a rare exception. You can find doubles and triples easily and there are also quad rooms although 4 on a bathroom is not ideal. 3 nights is not a great idea for an apartment -- the hassle factor versus the limited time. Some aparthotels have two bedrooms and that might work but I'd look for a couple of hotel rooms myself especially if the kids are a bit older.

We can recommend Hotel Montpensier in the 1st. Our family of five had a big room with 2 full size beds and 2 twins. Friendly staff and close to Louvre, Palais Royale, Opera, etc.

Hotel Excelsior Latin has suites that accommodates five people. I stayed there in a triple in 2016 and will stay again later this year.

http://www.excelsior-paris-hotel.com/en/

I’m researching a trip for four, and have a list of hotels with connecting rooms. Most are a triple room, and a double room. Some include a sofa bed. Rates for 3 nights at end of June are $852-$1864. I haven’t stayed at any of these, so I can’t give a personal recommendation. I’m researching apartments, separate rooms and connecting rooms. I think having 2 baths is a plus (especially for 5 people) and finding apartments with 2 baths is challenging.

Hotel Residence des Arts (most expensive)
Virginia (least expensive)
Hotel Aiglon
Arc de Triomphe Etoile
Arc de Triomphe
Grand Hotel Leveque
Gavarni

I would add Hotel D’ Angleterre for a family of 4 if the children can share a pull out bed. Quiet location in Ste Germain du Pres.