We booked this apartment for four colleagues on business trip, and it was a very good alternative to four expensive hotel rooms.
The apartment is very clean and recently renovated, in a stylish building. The four rooms are large enough, and there are two bathrooms, as stated in the previous reviews, there is one master bedroom and three en-suite "children's" rooms, one with the bathroom and the middle one requiring to go through one of the other rooms to go to the common areas. The living room is large enough to have breakfast or dinner, and there is a small seperate kitchen.
Louise was very friendly and quick to respond, and gave perfectly clear instructions on how to get in.
The neighbourhood is pretty generic (well... it's still Paris...) but very close to the champs-elysées and the apartment is close to three different subway lines.
So overall a perfect place for a family or a group of friends spending several days in Paris. Recommended!