I can recommend Elen's apartment without hesitation. La Villette is a great place to stay in Paris if you look for an authentic place. There is so much going on in this lively area, which is full of nice cafes and restaurants. From La Villette you can go to all central places in Paris by metro in a short time.
Elen's flat was very nice, comfortable, quiet and very clean. We especially enjoyed the balcony! Our dog Gaia was with us and loved sleeping out there.
We were greeted by Laure, Elen's co-host and felt immediately at home. Communication during our stay was perfect and we even had a coffee with Elen and Laure when we left.
Elen's place wil definitely be my first choice for my next visit to Paris!