I was curious about the price for a hotel room in the area of the Louvre, and I can tell you, if you have to ask, well...
Philipp's place was the perfect alternative. No glamour, no luxury, but plenty of value for a visit to Paris for 1 or 2. Small elevator is great, security is great. Quiet street in a quiet neighborhood, some occasional neighbor noise. Fran Prix grocery nearby with beer, wine, even a liquor counter. Dozens of cafes and bistros with all kinds of food/beverage options within 2 minutes walk. Laundromat next door. Excellent boulanger/patisserie across the street, and super-convenient to Metro and Le Louvre. Bon Voyage!