We had a fantastic time staying at Natalie's apartment. Very convenient for all sites, easy walking distance to Norte dame. Apartment is located in very good neighbourhood, very safe, very clean. Recommend restaurants on rue du mouffetard, on a practical note Carrefour on rue due Monge ( 50 metres from Cardinal lemoine metro station enterance). I would definitely recommend Natalie's apartment (& thank you for the bottle of wine).