Apartment in le Mairais, close to Pompidou Museum.
Location is really good, just 15 min walking to Notre Dame and just in the next street to Pompidou Museum. Neighbourhood is active and lot of restaurants to dinner.
Apartment is nice and in good conditions. More little than it seems in pictures and only 1 bathroom (to have into consideration in case many people). For us (5people) it was enough and we enjoyed a lot the stay there.
The most attractive point is indeed location. It is priceless to visit paris walking! I would repeat!