While the Opera is not my neighborhood of choice for Paris (unlike Marais or Saint Germain des Pres, it feels less local etc), this hotel may have changed my mind. The rooms are very small, but modern, well designed, and super clean. The gym is probably the best I've seen in Paris so far, and it has a spa with a sauna.
The staff was incredibly kind. The location of the hotel makes it convenient to get pretty much ANYWHERE in paris, and the hotel was super clean and the AC worked well. Everything during our stay was fantastic.