We stayed here with our two teenagers on the front and back end of our France vacation. It was easy to find and not a difficult trip from the airport. The staff spoke perfect English. Our first room had two areas and seemed to previously be two rooms, as there were two bathrooms. This was room 5, I think. It was great having two bathrooms for four people! One area had a queen bed and the other had a twin with a trundle. It was a little small but comfortable and clean.
At the end of the trip we had a different room (17 maybe). Similar beds, but a different layout. It had a tiny balcony into a courtyard (not pretty, but cute balcony). This room only had one bath. Again, comfortable and clean.
We had no problem with noise. It is not on a major road. There are some clubs near by, but it was not loud. It is close to Notre Dame area, Isle St. Louis & the Pompidou. A bit far for the Eiffel Tower and Sacre Coeur (not direct a Metro trip). The Marais is a nice area we had not explored before. We wanted to be near Gare de Lyon, which we needed to take a taxi to.
We did not have a problem without AC because it was cold outside! Would probably be stuffy in the summer.