The Three Lions have won all three games since the 2014 World Cup as they look to banish the demons of a disappointing tournament in Brazil, and Gibbs has said that the youthful squad are in a jovial mood.
"Everyone knows each other quite well," the Arsenal left-back told the Daily Star. "There aren't too many new faces. Spirit is good.
"It's very relaxed and there's a feel-good factor in the dressing room. It's fun."
Gibbs has also said that Danny Welbeck has been the butt of many jokes following his move from Manchester United to Arsenal, but he reckons that it all contributes to the relaxed atmosphere within the camp.
"We have great banter. Danny's made the switch from the northern table to the southern table at dinners and stuff.
"He's getting a bit of stick from the northern boys, but he's been properly welcomed to the south."
Gibbs has earned four England caps since making his international debut in 2010.