Emmanuelle's apartment has a lovely atmosphere--it is filled with books and an interesting collection of ads/postcards/photos. It is efficiently organized and contains everything you will need, including a clothes washer and a fully-equipped kitchen. The bathroom and toilet are small but functional; the pull-out sofa, when extended, takes up most of the living room area. However, the sofa is very comfortable to sleep on (not like the thin, spring-type ones we have in the US.)
The apartment is in an interesting neighborhood (filled with rare book sellers), good for walking to many sights--six minutes to Luxembourg Garden; 10-15 mins to Notre Dame; cafes, restaurants and a wonderful boulangerie just down the block. There is some street noise at night--I frequently use earplugs when traveling, and with them I slept soundly. My husband and sons slept fine without them.
Communication with Emmanuelle was easy; she flexibly and kindly dealt with our needs (including an arrival about 30 minutes after we had expected). Emmanuelle met us at the apartment, showed us around, told us about the neighborhood. Overall, I would recommend her apartment as a good base for people who plan to spend their days out and about in Paris.