The location of the apartment is incredibly good, you can reach the metro in a 2 minutes walk for C,E (blue line) and 5 minutes walk for 1 (red line) and to go everywhere.
Daniel is very kind he replyed to email very fast. He answered all my question and kindly accepted an update on reservation.
The apartment is on the 4th floor without elevators (as clearly stated by Daniel) but is not a problem unless you have physical impairment or disabilities. The zone around is really good with a lot of caffè, groceries, shops and resturants. If you can book the apartment do it.