Look it up at the ryanair hotels website, they usually have very good offers.
The rooms are very comfortable, clean and very well equipped, the staff very friendly and the breakfast buffe excellent.
Great location too - close to the gare du Nord, in between 2 metro stations and only a 15-minute walk to the central square.
HOWEVER: it is so well hidden, that it took us hours to locate. It's pretty simple after you've found it once, but it would be best to ask the hotel for precise instructions of how to get there beforehand.
