The space is excellent, we enjoyed our stay. The apartment was stylishly decorated and it was big compared to many studios we have stayed in around Paris. You can use the cooler for when it gets too hot, which we did on one occasion.
There are so many things to see and do around Montparnasse, you won’t need to leave the area. It really is a ‘cool’ neighbourhood.
Unfortunately Montparnasse station is undergoing renovations and you can hear lots of building noise during the day, but once this is completed it will get better.