I can recommend Marc’s apartment wholeheartedly! It is located in the center of Paris. You need only few minutes walk to Notre-Dame and the Seine. You can walk almost everywhere and you don’t need to take the metro:) The apartment is very comfortable and cosy. We had a great time in it! The only shortcoming: because there is a church opposite to the building the church bells are very loud.
But as we don’t mind the bells, we had a wonderful time in Paris and Marc had given us the opportunity with his great apartment. Thank you!