This top floor duplex apartment is simply fantastic: a Glass-enclosed bedroom with an open bathroom and glass-walled shower on the first floor, and a veranda living room with kitchen on top floor.
The view on the Opera and Sacré Coeur from the top floor veranda is unique — you are like a bird flying in the Parisian sky. The design elements (lighting, furniture, marble, Sonos sound system, TV) are top notch. The air conditioning works well and allows to enjoy the space even in summer (there are also electric shades).
This apartment is probably best enjoyed as a couple (open bathroom). I liked the 'secret entrance' feel as you have an elevator up to the 5th floor and then open a secret door to climb the stair to the last floor. The hosts were very friendly, discreet and efficient (they helped us organize a meeting by providing chairs).
The location is super central (Opera) which means you are 5' walk from Galeries Lafayette, Madeleine, Place Vendôme, 10'/15' walk to Tuileries garden, Concorde, Bourse, 20' to Musée d'Orsay, the Seine banks, etc. Also good Métro/RER just 2' in front on the building.
A gem not to be missed.