Me, my sister and a friend of mine had the best time in Marion's flat and Marion herself has been the best host you could ask for for the whole duration of our stay.
Originally, we had booked a different flat, but when we checked in there, the place was awful so we had to look for a new flat as we did not want to spend the night there. We found Marion's place, we requested to book it and to check-in immediately and Marion accepted, literally saving the day. As her flat was obviously not ready (she only had 1 hour notice), she let us stay in another flat, which was spacious, clean and beautiful overall. Also, she did not charge us for the nights we spent in the bigger flat. Once her flat was ready, we swaped places and we moved in the property we had booked. The flat was great: big enough for three people, clean and tidy, very pretty overall. The double bed is very comfortable and the mattress Marion gave us (we needed it as there was three of us, but the double bed was naturally for two people only) was very comfortable too. The location of the flat is great: it is in front of Le Bon Marche', 5 min away from Sevres-Babylone metro station and 10 min away from Saint-Placide metro station. It takes only 10 min by metro to get to Ile-de-la-cite', 15 min by foot to get to the Orsay Museum. The flat is close to a very nice supermarket (Le Bon Marche' Grand Epicerie), to Carrefour and Monoprix. In general, it is situated in a very nice area of the centre of Paris. Marion was really a fantastic host: she was available at all times, she always replied to my texts very quickly, she let us use the washing machine of the bigger flat even after we moved out of there, she was always glad to recommend us beautiful places to visit and nice restaurants. We loved staying at Marion's flat and I would recommend it to everyone!