The room I got was not pretty like on the pictures so it was disappointing. I got a noisy corner room on the first floor which had a stale smell when I entered. I tried to change it right away but the late night receptionist said there were no others available but apparently there were. Also, I had to call the hotel itself a couple of times as my request was not answered. Possibly the hotel isn't used to airbnb reservations, or the receptionist present that evening isn't used to them.
The breakfast was quite good and plentiful though.
The Montparnasse cemetery is a 3 mn walk. The train station about 15 mn.