Greetings Wall882 - Welcome to the club no one wants to join, but all here are friendly!
First, everyone's AN is different. I was 55 at diagnosis and active. Hearing went from 90% to no serviceable hearing in 4 months. My AN was slightly larger than yours (but not by much). I would recommend meeting with several facilities, chose one, and then meet with specialists in both surgery and radiosurgery. At this same time, read as much as you can about treatments and outcomes, especially research papers. I found one that says best outcomes received at facilities which treat higher volumes of cases. In my state, one facility I went to sees about 200 cases a year (old and new). The other sees about 200 NEW cases or more per year. Guess where I went!
I chose the Gamma Knife treatment, and had it in July 2019. My next visit will be July 2020 for a follow up MRI to see what is going on. I have a "hearing aid" which consists of a transmitter and receiver, struggle with dizziness and balance and sometimes nausea in certain situations (darkly lit places, turning head fast, bouncing while riding in a car) and tinnitus. That being said, I still do yoga (struggle with the balance poses) and Zumba once per week. I average 8,000 to 10,000 steps per day on my fitbit. Hiking is still something I enjoy, I did an all day tour in February in Costa Rica which involved a lot of hiking (and great scenery!)
Do your research, you will find something that makes sense for you, and makes you feel comfortable. Best of luck on your AN journey!