Me and my fiancé stayed in staphanies apartment for 3 days.. it was very very nice stay. Apartment was clean and had all basic facilities.
Street out side could be loud.. but if you close the windows.. you don't hear much.. but in summer that can be a problem.. but not a big one.. we were not too fussy about it.
Apartment is nicely located near saint michel canal.. which is a nice area to go out.. with alot of bars.. nearest metro station is also not very far.. and is well connected.
Stephanie was also helpful in giving us directions to the are around the apartment.
We went during the word cup.. so the only thing missing was.. there as only one channel on tv that showed football but not all the games. But i wont hold that against the apartment or the host. :-)

Over all a nice stay.. would recommend it..