The location of this apartment is great! Rue des Martyrs has everything you want and expect in Paris: shops, restaurants, bars, patisseries and other delicacies. You are near public transport and climbing up to the Sacre Coeur on your first night for a view over Paris is wonderful! The apartment itself has everything you might need and is very clean and comfortable. The only downside is maybe that there's little daylight and that you hear the metro rumble and you hear the footsteps of the upstairs neighbors. We weren't bothered by this, so for us it was perfect!