Charles' apartment is great. If you're coming to Paris for business for pleasure it's the perfect studio for people who are going to be out and about a lot. No bigger than a good size hotel room, but spacious enough not to feel claustrophobic in any way. The bed is comfortable, and the shower hot so what more could you ask for. I wasn't around enough to talk to Charles much beyond the check in but next time I'll definitely make the effort.
Big plus points here for the elevator in the building and just how blissfully quiet the studio is.