Check in process was smooth even Katia was not at home during our stay. The apartment is very clean. The building has lift so 4th floor is no problem. Katia is very helpful & resourceful, contactable anytime. The location is very strategic, close to everything, you can see Eiffel tower from there. Crossing the street, there is a bus station straight to Eiffel, Arc d tromphee, Champ Elyssees. There is a good bakery in front of the apartment, the croissant is very delicious (thanks Katia for recommending me). There is also Eyfel restaurant who sells Muslim-friendly (halal) meals. Grocery store like Franprix & Carrefour are also within 2 minutes walk. Thank you Katia!