Sebastien's sixth-floor apartment was a welcome retreat after long days seeing the sites of Paris. Our party of three stayed here 10 nights in late May, and we found these attic rooms quiet and relaxing. Our first couple of days were warm (mid 80s), which was a bit of a struggle for the air conditioning unit, but soon the days dropped into the 70s and we were very comfortable.
The elevator is very small (a tight fit for two people), and it only reaches the fifth floor. The stairs to the sixth floor are narrow and a bit twisty. So if you have trouble with stairs, keep that in mind. On the other hand, if you want a light workout, walking up the six flights is the way to go.
The apartment consists of 3 rooms: a bedroom, a bathroom and a multipurpose living room/dining room/kitchen/2nd bedroom. The exposed 19th-century beams and steeply slanted walls are charming, but might pose a challenge for particularly tall folks. The bathroom is fully equipped with a shower, separate tub, sink and washing machine. A dryer is accessible from the hallway. The kitchen has an electric stove and oven (we didn't use these), a microwave, coffee machine, toaster (also didn't use) and sink.
The place was very clean and approachable. For our size group at least, it felt more than roomy enough.
The apartment is on a side street with plenty of excellent places to eat and shop nearby. Two Metro stations on different lines are a short walk away, which made getting around a snap. Also, don't forget the busses, which take the same tickets and Navigo cards as the Metro.
Sebastien was an excellent and responsive host. His English is excellent, so communicating with him was easy. And when we were ready to leave, he even arranged a taxi for us.
Highly recommended.