The former Sheffield United winger has quickly settled since his summer arrival.
Francis said: “He's settled in really well with the lads. He's been a real breath of fresh air for us.
“He's very laid back off the pitch, which I think is why he's looked so calm and assured on it.
“He's provided that left foot out wide that we haven't really had for a couple of years, probably since Matt Ritchie left really.
“His signing has added another dimension to us going forward and he's been excellent so far.
“He can also still improve, and we're looking forward to seeing him continue to develop."