@Nikki339 Whether you leave a review or not doesn't incur "losing points". But as Mike and Jane point out, you not leaving a review in no way prevents the guest's review from being publíshed.
I would have just explained to the guest that I was very sorry that the neighbor created a noise disturbannce, but that you had no advance warning of this, nor do you have any control over whether a neighbor chooses to cut down trees, mow his lawn, use a leaf blower, or anything else.
And you really should never enter the guest space without clearing it with the guest first. It's an invasion of privacy, regardless of why you did it. Obviously if it's an emergency situation, like you see smoke or water pouring out of the house, there may be no time for advance notice, but otherwise, never just enter without asking the guest.
Not only is it an invasion of privacy, if the guest reports it to Airbnb, it is considered a serious trust and safety issue and they can suspend your account or delist you.