Sonia and Karim's apartment was great. Very centrally located, but not in a touristy part of Paris so you can experience the neighborhood like a local. The Metro stop is just a short walk (5 min) away. It's on a quiet street, cars cannot even drive on it, so your sleep will be undisturbed. Sonia was incredibly helpful with our late check-in and gave us lots of advice about where to get the best bread, croissant, etc. When I needed a hair dryer Karim brought one over straight away. The apartment is huge (3 bedrooms, 2 full baths) and beautifully decorated and everything is incredibly modern and up-to-date, with an incredible array of technological features. It's a great home-from-home in Paris.