Helen and Domonique are a very sweet couple and made me feel welcome my first time in Paris. They offered many suggestions for things I could do and cared about my safety as I was in Paris during the rallies.
Regarding the space, you have a private room and bathroom that is separated from the rest of the apartment (a private suite if you will). However, you do have to come out of this suite to use the toilet (which is also for the guest only). Note that you do not have access to the kitchen. The room is a dual office/living area with a nice little balcony overlooking Paris that can be converted into a bedroom via a descending murphy bed (I found this very cool!). Helen and Dominique have the room and bathroom equipped with everything you could possibly need from water to international adaptors to fliers tourist places of interest. Every morning, Helen prepares a spread of fruits, croissants, bread, and pastries which helped me save money on food! Finally, the apartment is conveniently located in front of a train station.
In summary, I enjoyed my time here and I would recommend it if you're social and would love to interact with sweet Parisians.