We spent 2 nights here in early September 2011 during a 3 week tour of France. I am very familiar with La Rochelle (it's an excellent short break destination) but had not stayed in Hotel Champlain before.
We had a second floor room but had no issues with street noise; we had the large casement windows open early each morning to let in the warm fresh air. Our room was large and clean with antiques and a well equipped en suite bathroom, with comfy soft bathrobes too. The comfort of the bed was excellent, with good quality mattress and bedding and plenty of pillows / bolsters.
Secure parking was very important to us as we were touring in a soft top MX5, so the private indoor parking in the building next door to the hotel was most welcome and worth the 7 euros a day.
Without exception, every member of staff we had dealings with, however minor, was cheerful, polite, helpful and professional. This is the most critical factor in our view, because no matter how luxurious or well located your hotel might be (and the Champlain is both of these), if you can't wow the guests you are dead in the water - so top marks to the staff here!
Don't know if it's been mentioned but the hotel is also adjacent to Parc Charruyer, a beautiful park which runs almost the whole length of the city. Simply walk out of the front door, turn right, cross the road and you will see it. Bear left on entering the park and you have over half a mile of traffic free gardens and trees to wander through on your way down to the beach.
Incidentally, if you want to fly to La Rochelle for a short break, it couldn't be easier. We fly from Stansted (1 hour 10 mins) to La Rochelle, turn right out of the airport main entrance, 150 yards to the bus stop, no 7 bus (it's about 1.3 euros each) takes you straight into Place Verdun in the centre of La Rochelle. Hotel Champlain (and plenty of other hotels, for that matter) is about 250 / 300 yards away - ask at the police 'station' on Place Verdun if you need directions.
So; if you are going to La Rochelle, and you want a classy, welcoming hotel, spend the money and try the Hotel Champlain. Excellent.
Room Tip: Rear rooms have garden views. If you have a front room, second floor or higher is quieter.
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC