My stay at Fransje's studio was great. She was very attentive and responsive. Since she wasn't available when I arrived I was greeted by a friend, who provided the keys in a timely manner. The studio included plenty of directions for local sights and services, which is very helpful when visiting a new city. Fransje was also kind enough to provide a few supplies for a meal, which considering I arrived late on a Sunday was very fortunate (few places open on Sundays in Paris!).
Overall, a very enjoyable experience and highly recommended, if you plan on spending your days outside the house but want a quiet place to sleep.