Charlotte's flat was perfect. I stayed in Paris for five nights, and was more than happy. It is relatively small, though, for the price paid per night, I thought it was a bargain, very reasonable. A small kitchenette, living space with a sofa bed, and a small bathroom, ideal for one person. It was tastefully furnished and very clean.
Location itself, plenty of amenities nearby, shops, bars, restaurants. I ate very well, even whilst watching the pennies. Location itself, five minute walk to the nearest metro, and then not more than ten minutes to the centre of Paris. Area felt safe, it is a suburb, but had no issues.
Charlotte herself, though we did not meet in person was helpful from the beginning, and frequently stayed in-touch to ensure arrival and check out was smooth. No criticisms at all, highly recommended.