We had a great family time in the apartment. The building is well maintained, nice and quiet. Still, so central - we could walk almost everywhere - the big stores, Louvre and musee d'Orsay.
The apartment is at the top floor - there are big windows that give a lot of light, but one can close the shields to have it private - at night for example. Central heating was great (as we visited in December). Our host - max, was super fast responding to messages.