CitizenM, a good choice. I love the incongruity of such a modern and reputedly hip hotel planted in the remarkably un-cool Champs-Elysées area. But good luck on learning how to correctly pronounce “rue la Boétie”.
A warning. The Champs-Elysées area is often called “un désert gastronomique”. The reputation for over-priced mediocrity is well deserved, but there are exceptions. Unfortunately, the few restaurants that don’t cater to the masses of not very discriminating tourists tend to be closed on Sat + Sun. If you are in Paris for just a long weekend, oops.
My office is at the top of the Champs-Elysées and so my recs are the largely the result of expense-account lunches, and dinner may be different. Indeed, the Champs-Elysées is an area at the bottom of my list of where to go for a dinner to enjoy a less artificial version of “la vie parisienne”.
In order of the quality of the cuisine:
Le Gabriel in La Réserve hotel on avenue Gabriel… Michelin 2-stars, genuinely stylish, 88€ “bargain" lunch (dinner is 3 or 4 times the lunch price), about a 600-metre walk from your hotel;
Origines on rue Ponthieu… exceptionally good modern French star-less but star-worthy cuisine, 5-course tasting menu for 85€ for dinner or somewhat pricey à la carte menu but easy enough to get a meal at your price point if you are careful, clientele is a mix of politicos (Macron’s residence is just around the corner)/ PR types (of which I am one)/ fashionistas/the occasional celebrity chef, most conversations here sound like a conspiracy or a seduction and so not a place for a raucous group meal, and one of the few restos in this area that I enjoy for dinner as well as lunch, a 5- to 7-min walk from your hotel, and, like most good restaurants in this area, closed Sat + Sun.
Le Mermoz on rue Jean-Mermoz… very adventurous French-trained American chef, a relative bargain for this area, not sure of the current format for dinner but last time I was there it was wine-bar French tapas style, lunch is more conventional sit-down and usually fab, closed on Sat+ Sun, 500-metre walk.
Le Boudoir on rue Colisée… a resto/ wine-bar, 3 or 4 different spaces (including a cigar lounge), a sort of bistro with very good “cuisine bistronomique” as well as a wine-bar with platters of excellent charcuterie and cheese in the evening, my favourite venue for after-work get togethers for an apéro, 300 metres from CitizenM.
Bistrot Marloe, rue du Commandant Rivière/ rue d’Artois… maybe the most « fun » place on my short list, very good bistronomique cuisine, excellent value for such an over-priced area, a rather diverse menu which includes an totally awesome updated version of the traditional croque monsieur, could be suitable for a group meal during the week but closed on the weekend, 300-metre walk.
BTW, when will you be in Paris ? There are some weeks/ events that will seriously affect restaurant choices.