Very pleasant, smart design in a compact space. Sebastian's staff was great though were limited in their ability to assist when things like a broken elevator, constant fire alarm buzzing and door code was suddenly not accepted.
Location is excellent: you're surrounded by many great restaurants/cafes, 3 metro stations under 5 mins, Rue de Martyrs outstanding foodie street, grand magasins/Opera/Madeleine just short walks away. Sweet view of Sacre Coeur, especially at night.