Although the hotel has a 3-star rating, it is one of the best hotels I've stayed in while visiting Paris. Suite 52 has a lovely side-view of the back of the Louvre. It didn't quite look like the picture on the website, but it was charming. The room was more comfortable and clean than 4-star rooms I've experienced in Paris.
The location is brilliant. Not only are you beside the Louvre and close to the river, but you are within a short walk of Rue du Rivoli and many shops. You're also a short taxi ride from everything in central Paris. Kong in the Kenzie building is just a few minutes walk away. I highly recommend going there for a drink. As one of Phillip Stark's designs and in a beautiful location, it is a unique restaurant. The food, however, is mediocre. (This is the glass-ceiling restaurant that overlooks the Seine, where Carrie has lunch with Alexander Petrovsky's ex-wife)
Most importantly, the staff at Relais du Louvre are FANTASTIC. Upon check-in there was a mistake on MY part, but the receptionist went out of her way to make sure we received what we wanted. She also rushed to help us with our bags. It wasn't so much the fact that she helped us, it was her enthusiasm while doing it. You could immediately tell that this was hotel that truly cared about their guests. You don't expect to meet such wonderful staff in Paris, but we did! I had also forgotten something at the hotel and when I e-mailed to ask if it was there, they offered to mail it to me! Some hotels wouldn't even reply. 5 days later I received a package with my forgotten (but very important) item.
Londres, Royaume Uni