The Louvre St. Romain is a reasonably priced hotel in a perfect location. Located right next to the Tuileries metro stop, it's central to all of Paris. It's walking distance to the Louvre and the Mussee Dorsay.
My hotel room was larger than I expected though the shower and elevator were a bit claustrophobic. I did have to work a bit on this trip and the internet access in the room never worked for me, though they did have a computer in the lobby you could use.
All in all, for a tourist on a short trip, I would definitely recommend this hotel.