Hi Zia and welcome to this forum of caring new friends .....
It is a traumatic experience to be unexpectedly diagnosed with an acoustic neuroma. I am so glad you are researching everything you can find about treatment options for your wife. I hope she is able to look at some of the positive results from treatment and take comfort in those.
I presume your wife's tumor is 1.5 x 1.7 cm, not mm. Correct?
In my admittedly biased opinion, in my mind you can do no better than Dr. Friedman (otolaryngologist) at USC or Dr. Marc Schwartz (neurosurgeon) at House. Together they totally removed my regrown tumor (do not panic, it is very rare for a tumor to regrow), without any facial nerve damage. I was walking downtown in LA nine days after my surgery, which is also a bit unusual ..... my brain had already sorted out my balance issues following my first surgery three years earlier. I flew from the eastern half of the US for my surgery at House and so glad I did!
Dr. Friedman is not only a top-notch surgeon, but he is a kind and caring person, who is genuinely concerned about the surgical outcome for each of his unique patients.
Many thoughts and prayers as you both walk this journey. Let us know any specific other questions.