The most PERFECT location possible! Le Marais is my preferred arrondissement, and Cedric's place is right in the center of the best part! His apartment is super clean and modern. The bed is very comfortable, and there is extra room for others on the pull-out sofa and in the small loft room (see the ladder).
I will say that like most Paris apartments, there is no lift (elevator). So be prepared for the 101 steps up to the apartment. But once there the views from your bedroom window give you great views across the rooftops of upper Le Marais!
It is very safe and secure, and a very friendly area.
I would highly recommend Cedric's place!