Lens for indoors? good

Lens for indoors? good ، Lens for indoors? good

I’m looking at renting a lens for my daughters birthday. I have a 17-40 f/4L, but am thinking need something like a 1.2 or a 1.4. Can’t decide on the focal length though.
http://www.borrowlenses.com/category/canon/all

Thinking of renting http://www.borrowlenses.com/product/…non_24mm_f1.4L and a 580 EX II flash.

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