we stayed at the junior suite on the 6th floor for a week.
we like its good location and kind staff!
close to Saint German Des Pres area and Jardin du Luxembourg.
easy to get to the CDG airport.
if you want to make a short trip from paris, it was good to stay at the hotel because you can get on TGV from Monparnasse station. you can take a bus to Monparnasse station early in the morning too.
be careful, the name of the hotel has been changed!
old : Atelier Saint Germain
new : Atelier Monparnasse
check google street view, if you want.