Claude's place is in a very good area. A street full of coffee shops, restaurants and other shops. It is near 2 metro stations in addition to Gare Montparnasse.
However, since the apartment is in the 2nd floor with no air conditioning, you might need sleep with windows open and suffer the very noise street until 2AM and the start of business at 6:00 AM. If you are one of those who cannot sleep with noise then you should take care.