We just stayed at the Hotel du Pantheon and had a fantastic time. The rooms have a truly Parisian feel and the location is totally unbeatable. We were 3 friends on a nice w-e away and got room 62, which they can arrange for 3 adults - the views from our room, on the 6th floor, were breathtaking, overlooking the Pantheon and with the Sacre Coeur in the distance... They're not huge but are nicely decorated in a very Frenchy way and clean. It's got that "oldie-goldie" look about it. Service is very friendly. If you want a high class hotel, this may not be for you. But if you want a good value-for-money hotel, in which you do feel you're in Paris, this is definitely a great option! Next time I'm in Paris I will definitely repeat.
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