I stayed at Bernard and Catherine's apartment while travelling for business in Paris for the last 5 months. It is a very nice, bright and well decorated place, with everything I needed to feel home every time I came back. The building is located in a nice area of Paris, it is very secure, with great, friendly neighbours and a very helpful concierge who was there when I needed.
It was very conveniently close to my office, and also very central, just off the porte de Ternes. 20 minutes stroll and you are at arc de Triumphe, 2 metro station within walking distance(lines 1 and 3 ), a stadium to run right outside the door and the bois de boulogne 10 minutes walk away. The internet connection was fast and seamless, tv, cable, phone included, and all appliances, including the new washing machine.
Please be aware that it is close to the perifirique highway, so there is certain level of noise, of cause. But windows provide a good sound protection, and it is very green around the building, with mature tall trees. A cherry on the cake - you can see the tip of Eiffel tower from the balcony, and it sparkles beautifully every hour after sunset! Will definitely stay there again for my next visit ti Paris!