Karine's place was wonderful and she is an exemplary host. The flat is on the 4th Floor (5th to American conventions), so the walk up and down is nearly 100 steps, which may be a consideration to some guests. The flat was comfortable and delightfully sunny. Karine has a good collection of DVDs and books; this is definitely an Airbnb with a lot of character!
Its best attribute is its location in Le Marais (4th arr). The street life is lively, and there are many delightful dining and shopping opportunities. Mind that the flat is above some bars that may generate noise into the early morning; for us this was no problem, but it may be for others. The bed and the furniture are comfortable and practical. The best part of our visit was in sitting out on the sunny enclosed terrace to have our breakfast every day.