My family and I enjoyed our stay at Greg's flat over the holidays; I can't recommend it enough!
Greg was very proactive with arranging our check-in (a Christmas hamper was a lovely surprise!), always suggesting great places and offering help with making all necessary reservations, and generally was super responsive despite the festivities :)
The flat is spacious and nicely decorated. It is located on a popular street with plenty of restaurants, bars, clubs, theatres, and independent stores, but it never felt too busy, loud or overwhelming. The location is superb: practically everything in central Paris is within walking distance but there is also a tube station 1 minute away from the building.
I can't imagine a better place if you are travelling to Paris with family or friends.