Klaudyna is a sweetheart. She made every attempt to make us feel at home and comfortable. However, the apartment is very very small. For 2 people, it was way too small. When the bed pulls out, there is almost no space left in the apartment. The apartment is very cleverly designed, but it is so full of stuff, that there's nearly no space for guests. It was also very hot the week we were there, and with only a mini-fan in the bedroom, it was difficult to sleep.
The pull-out bed was extremely comfortable and the wifi was fast enough to do work. The little touches like coffee and cereal were very nice. The location is PERFECT, right in the heart of CSM. It's my favorite area in Paris.
I'd say that this place would be ideal for a single person who is traveling light and who values location over space.
I would recommend to Klaudyna that a larger fan was purchased for guests during the hot days/nights.