If you want specifics, check local libraries (especially university) and see if they have access to the ProQuest searchable online version of the New York Times. You may have to go there in person to use their databases, but if you are a student or library patron (or know one and can borrow their login details) you can do it from your home computer.
Once you're in the database, you can search "Paris hotels" and limit the dates to the ones you're interested in. You'll get a bunch of hits, including articles from the travel section that detail location, price, amenities, etc.
I'm sure there are other databases (newpapers, magazines) that will work, as long as they are indexed--the NYT jumps to mind because it's so incredibly useful.