Hi Jackie, I'm just looking at the deck plans and if they're correct here's what I see. E519 is above the very outside area of the Explorer's Lounge. There shouldn't be any noise from there.
It shows your cabin with the back of a lifeboat obstructing your view. If you're lucky you'll be able to see around the boat, or you may just have light
There's a picture on the Princess site: Sapphire Princess Deck Plans : Princess Cruises
It really looks like a balcony cabin without the balcony to me, but I know these picture's are "representative".
I'm sure you'll have a great time no matter what