My wife and I stayed here for three nights, and it was a very enjoyable experience. As many people have noted, the hotel is located in Old Quebec, and we basically parked there and spent the next few days exploring on foot. It's pretty easy to get anywhere in the Old City on foot, so this was great.
The staff were extremely friendly, and answered any questions we had.
The coffee machine is, as others have noted, great. I recommend the mochachino, and the hot chocolate is also quite good. It broke down for a little bit on our second day, but they had it working again by the evening. They also have tea, and cookies set out in the evening, which is a nice touch. The room with the computer and coffee machine is very comfortable and warm, and it was nice to sit by the fireplace and read for a while during a snowstorm.
We stayed in a queen room, which was quite big and well furnished. My wife and I thought the bed was very comfortable, but if you don't like hard beds you should request the featherbed top. They should advertise this amenity more; we didn't see anything about it at the hotel. It was a little dark, but the furnishings go with the atmosphere of the place, and we thought it was nice.
We were on the third floor, and we had a partial view of the chateau, but if you want a good view of it you'll have to stay in nicer rooms on the upper levels.
The water pressure in the room is really nice; I haven't had pressure that good in a long time.
Breakfast was quite good; there is a reasonable selection with toast, bagels, juice, good coffee, ham pate, eggs and other basic foods. I thought it was a very good spread, especially compared to what is often served in continental breakfasts.
All in all, a very nice hotel, and I'd recommend it.