Lornezo, a friend of Antoine, was waiting for our arrival and he's been very helpful showing us the apartment. The apartment is just as what is described. In particular, the bed is comfortable and the water pressure is good!
The location is very good if you plan to travel Paris using the subway. It is only couple of minutes walk to the closest subway station and the connections of the subways system is excellent.
The apartment is in the middle of the tourist area close to Sacré-Cœur Church and it is a bit noisy when the windows are opened. However, the insulation must be good as it has been fine when we closed the windows at night.
I'll have to reservation in recommending this apartment to anyone planning a short stay in Paris.