Our stay at Jerome's place was absolutely incredible. The apt is situated in a lively, non very touristic neighborhood. There are many shops, cafes and restaurants around, as well as a market with fresh fruits and vegetables just round the corner. Almost all sights were easily accessible by foot. There are also two metro stations nearby (Villiers and Rome).
Jerome wasn't at home when we arrived, but his instructions were clear and we haven't had any problems with the access to the flat. The communication was great - Jerome replied to every my question in a moment.
The studio is spacious and has everything you need for the stay over a week - microwave, kettle, hairdryer, fridge, washing machine and so on. The design in the flat and the view are great (you can even see the Eiffel's tower from your window). It situated at the 6th floor, but even my mother (she is 64!) did not have any issues climbing the stairs.
To summarize, I would like to thank Jerome for the hospitality, and I definitely recommend this flat for a great stay during your visit to Paris.