I am at the Hilton Paris Opera now and as I stated above, I do not recommend it. It sits literally right in front of the St. Lazare train/Metro station (there is a bus driveway separating the station and the back of the hotel. I somehow did not realize this (I did switch last minute to this hotel and didn't have time to do my usual obsessive research). As with many train/bus station areas, this block has more than its fair share of unhoused people and it is a very high auto/bus traffic area. It is impossible to get an Uber in front of the hotel, you have to go across the street and even that is dicey. I have not stayed at the Maison Astor Hilton property, but based on my research I would definitely recommend it over this Hilton.
A couple of caveats to keep in mind with my opinion. I prefer aspirational properties and stayed at the Grand Hyatt Place Vendome in August so my standards were probably a little skewed coming into this property. We just stayed at 2 Conrads before this, so again expectations were probably a little skewed. I am paying OOP for the 4 nts here and it is a ridiculous rate for the quality of this location/property. So that stings.
A few pros: it does have the executive lounge which is nice to have even if it is mediocre (no bottled water ??); the train station being close is good when you need the Metro/bus; Printemps/Galleries Lafayette/Opera are a few blocks away; rooms/bathrooms are clean; and twin deluxe room is plenty spacious. If it is the only Hotel I could get on points, then I would stay here again rather than pay OOP. However, if I have any other option, I will not stay here again.