Hi there! And welcome! You have some heavy decisions to make, eh? Newf? Pyr? Or any Big Paw right now? You sound like a very caring person who is willing to put your "All" into a new family member. You're doing your homework rather than just jumping into a situation. Good for you!!!!!
I don't know Newfs. But they're definitely on my wish list. Along with Leo's, IWH, and several others. (Should I live that long.

)Pyrs are my life and I adore them.
You're getting some good input from first hand experiences. You'll be the one to make the final choice. And it's a lifetime commitment any which way.
My present two Pyrs (and two others in the past as well)are "inside dogs" for the very most part. I have also had LGDs who were people orentated but took very seriously their duties ~ so they were comfortable in the home but at the drop of a leaf they were out the dog door and on guard and always so during night time.
I'm in a very rural area so no neighbors are close. These Babes are, for the most part, quiet ~ with little barking. Unless someone slows down below the hill by the driveway. OR if someone walks up and knocks at the door.

You seem willing to walk and exercise a pup. But remember ~ this is Morning. Noon. Night. Heat. Freezing temps. Rain. Even if you're not feeling well youself. Also, a bored Pyr Puppy is a destructive Puppy. It takes only moments to destroy furniture, walls, floors, and such. They also shed like you can not belive during blowout. Example - I brushed both my Babes again last evening. (As I do each and every day.) By this morning there were enough Pyr Bunnies to make another dog.

The white fluff is EVERYWHERE!
If conidering a Pyr, perhaps you would want to go with an older ~ say two to three year old. The wee ones are adorable but ~ ~ it's a long road to maturity. Kathy is right about their being laid back for the most part. I have one (5 1/2)laying on my feet, and another (just turned two) close to my side. But it hasn't happened overnight.
Good luck. I know you'll make the right choice. And I look forward to any and all updates. Once you do ~ you know that BPOers will be right here to support you in each and every way. (Sorry. Didn't mean this to be so long.)
"J"