Everything was perfect! There are two metro close the apt. The flat is equipped with all the comfort (oven, microwave, a very soft bed). The wifi is also fast and there is a plasma TV. Sara was a perfect host, she sent me an email with all the info about restaurants, places to visit, supermarkets...
A very positive note is that the apt is warm when the heaters are switched on. We will came back for sure to Paris!!! Thanks Sara!