Ahead of tonight's Champions League quarterfinal first-leg at PSG, Emery discussed the Manchester United loanee.
He said, "He is a good guy, he is humble, he is a very good professional player, he is really happy with his teammates, he has been demanding himself in everything. We want to work with him, with the team.
"I think he is playing freely, he is playing comfortably, and this is the most important. We are trying to connect with him as a person firstly, and after that to connect with him as a player.
"His process here is getting better as well. He is playing in two different positions, he started as a left winger, now he is playing more as a striker. How he can exploit his qualities as best as possible with us. This is the process we have, still work to do, still process to do, but the most important is his feeling.
"We are seeing him smiling, it is the best news we can have. I am seeing him happy, I am seeing him committed with everything we are doing."