Karsdorp feels he's now playing the best football of his Roma career.
He told ELF Voetbal: "Mourinho makes me better. I used to like to drink and go out, now it doesn't happen anymore. The reason I came to play abroad was because of the Roma project.
"Here they allow you to be really quiet. Of course I get approached when I walk down the street, but in general the fans don't go crazy. If I'm out to dinner, they wait patiently until the end for an autograph or a photo.
"With injuries I wasn't able to prove myself for a long time, people started to wonder if I could stand the level and if I could still be fully fit. After my second spell in the Netherlands I came back, determined to succeed here. It worked and I became a starter.
"And it also applies here, if you play well, you are a hero, if you play badly you get criticised. Although, now that I think about it, maybe people are a bit more critical here than at Feyenoord."
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