We stayed at Alex's place twice on our trip to Paris - 7-9 Dec and 14-16 Dec. It was a pleasure liasing with Alex prior to the trip as he was prompt in his reply and was very helpful, even helping to make dinner reccomendations and reservation for my partner's birthday.
Now for the apartment, it was a lovely apartment that has everything you need. It's on the 6th floor though and might be a climb for some people (no elevator), but Alex met us to help us with our luggage upon arrival and departure so it wasn't a problem for us. The apartment was very clean and cosy, and has 2 heaters that worked wonderfully keeping the apartment warm in winter. Overall, we had a very pleasant stay!