The Cameroon international joined the Hammers from Barcelona on a season-long loan deal last month.
He made his home debut in yesterday evening's 3-1 win over Liverpool and when asked after that match about his happiness at being with the East Londoners, the 27-year-old told the club's official website: "I'm feeling very good and I'm very happy to be here. The fans and my teammates have been great.
"I played 60 minutes on Saturday and that was good for me. I need a couple of games to get up to 100% and then I'll be able to help the team like I did on Saturday."
Song joined Barcelona from Arsenal for £15m in the summer of 2012.