The hotel is very nice and clean and the paid breakfast is actually very good for busy travelers, but I was on the first floor just above the reception and so I could hear even when people outside the hotel rang the bell to get in. I had ear plugs which took care of the noise, you can also hear/feel the vibration of the RER train going underground and that was not pleasant at all.
Then the WIFI was horrible, it broke down all the time. I was on vacation, so I couldnt care, but if I was there for work, I would be very upset that I cant really use the internet. I told the staff my feedback about it also.
So perhaps a room in a higher floor would be ok. Despite these two problems, the hotel is very nice and the bed and pillows were very confortable and I slept very well despite the noise (earplugs people!).
And the breakfast was delicious. From the reception Christian and Marie were very nice and helpful. Another good point is that is right next to Saint-Lazare's station, so you can take any conections to metro or train from there. I would stay there again, but in a higher room.