Had our 18 month old child with us in F for a return trip to SFO. He loved it and the space made it easy for both us to keep him entertained without disturbing others and for him to entertain himself.
Dine on demand and the companion seat were a huge help as well. We were able to ask for our dinner on both flights after our child had gone to sleep. He slept in one seat while we had dinner together in the other.
The beds are also big enough that my wife was able to sleep in the same bed as him. He was big enough that smothering was not a risk.
We found it a great way to travel with a young child. So many aspects of both the cabin and the service make travelling with a young child so much easier.