I also wouldn't consider Neuilly to be in the heart of Paris. My company just had a partners meeting with about the same parameters (2 meeting rooms, 3 days/nights, about 15 participants) at the Sofitel Hotel Bercy (within the ring road but nearly exactly opposite end of Paris as Neuilly), and had excellent service. In fact, I wrote a thank you letter to commend one particular staff member to the hotel general manager; so happy to have this opportunity to give them a positive reference.