The Japan international midfielder made the comments on his official blog as he prepared to make his United debut this week against South African outfit Amazulu in Durban
The Japan international joined the club from Borussia Dortmund earlier this summer and appears to have already adjusted well to his new home.
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"Manchester is very relaxing and the time is flowing very slowly. I think this is a great environment for a football player."
Kagawa is embracing his humble roots in the J-League's second division by wearing the same number 26 he wore at Cerezo Osaka and he also took the time to praise his fans in Dortmund.
"The stadium's zealous and overwhelming atmosphere, all created by the supporters — the whole Dortmund experience will remain on my heart forever," the Uefa Player of the Year-nominated star wrote.
"Because of your support and cheering, I became who I am, and I am standing where I am now."
United boss Sir Alex Ferguson confirmed that Kagawa will be in his starting line-up against the Durban-based Amazulu.
"The priority is to get the experienced players fit but young players will play in each game," Ferguson told reporters. "It's likely that Kagawa will start with Chicharito."