I stayed at the Hotel Lenox Monparnasse for nine nights in July 2006. It's not cheap, it's not expensive. I strongly suggest you go to the hotel's own website http://www.paris-hotel-lenox.com/ which has pages for English and many other languages. At this site you can get the best rates including promotional rates. I have no promotional, business, or other financial interest in this hotel. I just think it is an excellent mid-range hotel in a wonderful location. And from the other 105 reviews at Tripadviser.com (see below for the url to the Tripadviser page with Hotel Lenox Montparnasse), I guess I'm right on target. Here is the review I wrote for Tripadviser.com when I returned to San Francisco
I stayed at the Lenox a total of nine nights. I wanted to live in the Montparanasse quarter because it seemed a wondeful combination of tourism and everyday life. Also the romantic history of the quarter attracted me (Gauguin lived in a hotel just down the street, for example). I also remembered eating at a great Breton crepe restaurant on rue Montparnasse which crosses Boulevard Montparnasse about four blocks from the hotel. At a nearby Tabac on Blvd. Montparnasse, Mme Brigitte recommended Creperie Plougastel on rue Montparnasse ("there are ten creperies but only one good one"). I went to Plougastel twice with friends; it was fun and the food was excellent as was the "cidre dur." The Lenox Montparnasse is very close to a morning market, to the restaurant/theater area of Montparnasse, to movie theaters (with movies in English), drug stores, antique stores, and to many other good, even elegant, stores on Blvd. Montparnasse. In the immediate vicinity you can find quick crepes and kabob restaurants, heavy-on-the-beef restaurants, like Hippopotamus as well as truly excellent fish, and other French cuisine restaurants. By "in the vicinity" I mean just steps away. At the Monparnasse Tower building you can find the Lafayette Department store, two sports clothes shops and all the other shops from elegant to bargains that you might need. One can walk to the Notre Dame, Louvre area in half an hour or take the Metro to San Michel and be there in fifteen minutes. There are three metro stations within quick walking distance from the Hotel Lenox so you have access to many Metro lines. For very quiet relaxation there is the wonderful Luxembourg Gardens about ten minutes walking from the hotel. The Luxembourg Gardens has a wonderful, fenced-in playground for children with a lot of great equipment, entrance fee is 2.50 euros for children and 1.50 euros for adults. If you are with children this is a great spot to give them an "airing." The Hotel Lenox is comfortable and restful and looks like it has recently been upgraded. From flat screen tv's to plenty of hot water and an excellently functioning and clean bathroom (important to me), the rooms serve as a great base for touring Paris. The staff are truly caring about their clients. They all speak English well (one worked for a year in New York), they are very quick and efficient. I would say they have a strong sense of responsibility for maintaining all aspects of the hotel's services from cleaning to caring for baggage left in the baggage room. Since I love the Montparnasse area and found the hotel a great base for touring the entire city and the hotel services totally up to my needs, I will certainly stay in the Hotel Lenox when I return to Paris.
Below is the url where you can find many more and more recent Tripadviser.com reviews as well as details about the hotel.