
I would enclose "without a doubt" with commas.
This is without a doubt an... → This is, without a doubt, an...

Thanks, also, I am not sure if it is better with 'without any doubt'?

The one you chose, "without a doubt," sounds much more natural here than "without any doubt." This sentence is OK.
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This sentence was initially added as a translation of sentence #3362306
added by neron, July 6, 2014
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edited by neron, July 6, 2014
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