The Good: The location is awesome! in the heart of the Marais!
The Bad: The building looks like a Prison, the Apartment is a studio turned into a two bedroom by adding dry walls (claustrophobic), The internet is beyond slow... Dial up works better... The apartment is on the first floor (almost ground) on a busy street, so do not expect any quite, I woke up several times at 3 or 4 am at the sound of people screaming... The apartment can get very hot in the summer and there is no AC so the window must stay open. I am not sure how 6 people can stay there if me alone I hardly could (and I am from New York with a tinny apartment)
I wound not book this place unless there is nothing else!