Nicholas place is a great cost benefit in the centre of Paris.
Good points: The location is awesome, there are metro and RER lines close. The space is good for Paris with 2 rooms and a sofa-bed, can accomodate 6 adults. There are good restaurants and markets nearby.
Bad points: The neighborhood is basically restaurants and bars, so its usual to have some noise from the streets until late.
We loved to stay with Nicholas, the noise wasnt a problem. It was easy to go to the main touristical places by foot or metro. So, i recomended this place for the best cost benefit.