I've stayed at the All Seasons Paris Chateau Landon in February 2010 and the experience was quite positive. There was free wi-fi and the buffet breakfast in the morning was quite good. However, the hotel did have a slight no-frills feeling (i.e. lack of toothbrushes / toothpaste but they did have shampoo / body wash that were very colourful - a bit disturbing).

Overall, it was comfortable and decor was quite stylish as mentioned above. They even offered a welcome amenity (for all guests), a pack of Ricola and two bottles of Evian water.