Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
I received this air bed over two months ago and we love it. I bought it for my granddaughter to sleep on and it's the easiest thing to set up and take down to put away. I put a mattress pad on under the sheets and she says she would rather sleep on the air bed than her regular bed because it that comfortable. No leaks so far. I'm very happy with this purchase.
Answer:
Positive