It is possible to have a cake delivered to your room at AKV Kidani. But..... (take this for what it is worth because I was very unhappy about my cake and will never do it again) I wouldn't recommend it. There are at least two cakes, in this thread, that were from AKL/AKV that were really great looking and then there was mine...
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Mine was a 6" vanilla cake with chocolate mousse filling and buttercream icing. This beauty of a cake

cost around $80. We threw half of it away and that was with four adults and three kids willing to eat it - it was tasteless. If you really want something in your room personally I'd suggest calling private dining and see if they have something like chocolate dipped strawberries or something like that.
Sorry for the negativity regarding an AKV cake but I was very disappointed and had been looking forward to it for months.