优秀
The apartment in Rue Descartes is excellent. The landlord, Mme des Ouches, is very kind and available to help.
I truly enjoyed my stay there, although in the midst of Paris recent attacks. The only real defect in the apartment, if I have to mention one, is the basin in the bathroom: it's far too small, even for a kid!
But for the rest, I repeat, everything was ok, including all the amenities (like superfast wifi, cable tv, ipod system, bath linen, etc.).
The neighborhood looks very safe (a big police station is nearby: an important feature given the tragic circumstances), but also very lively, with bars and restaurants. All you need in terms of shops, supermarkets, laundries, etc. is at most within a two minutes walk. Ditto for Boulevard Saint Germain, with all that means again in terms of facilities, metro station, etc.
Last, but not least, I had the clear impression that, despite the nearby touristic attractions (Pantheon and Saint Etienne du Mont are just 100m away and famous Rue Mouffetard's market is also very close), this is an area of Paris where real Parisiennes live.
Strongly adviced if you wish to experience for a few weeks what living in Paris may really mean.