We had a great stay at Guillaume's place, excellent location and communication was very good beforehand and throughout the stay.
Rooms were spacious, modern and clean. Our daughter (3 years old) loved all the kids toys and books. Guillaume arranged a travel cot for our 6 month old son which was a great help.
The stairs were a challenge at times with the pram but it helped my wife and I burn off the wine we consumed throughout the day!! :)
If we ever returned to Paris we would try our best to stay here again.