Nathalie and her husband Francois were amazing hosts!
They speak english really well and will answer any question you ask them. They were very kind to us and treated us very well.
The flat was amazing, you have a small elevator for up and down which is convenient for luggage. The room is just like in the pictures with a private shower and a private toilet just outside the room, everything was perfectly clean. You have a small fan/blower in your room which was enough to get us through the hot summer nights.
There is a Metro station (Raspail) literally in front of the house for lines 4 and 6 (you can get to most attractions in Paris with those 2 lines). There is also a Bus line (68) just over the street which was amazing as well. If you can get somewhere by bus do so as it is quite hot in the summer and you see a lot more traveling by bus :) .
There are a lot of cafes and a few supermarkets close to the flat which is another plus.
To wrap things up: one of the best spots to get a flat for your stay in Paris (safe neighborhood, you can get everywhere fast,etc.).
Thank you for everything Nathalie and Francois!