Hi jdamiano and welcome to this forum of new caring, supportive friends .....
Being diagnosed with a brain tumor is scary at best, even if it is benign.
Please remember that none of us are doctors on this forum, we just have much information from our own experiences and research. So, to address your questions:
1) If your tumor was described as an acoustic neuroma or a vestibular schwannoma (same type of tumor, just two different names), it grows on or around the vestibular branch of the auditory nerve which runs through the internal auditory canal from the inner ear to the brainstem. The facial nerve runs through this same area. Your symptoms and the MRI give your doctors a pretty good clue as to where along this path your tumor is growing. If you have perfect hearing now, it is possible to retain most, if not all of your hearing ..... IF you choose highly experienced surgeons.
2) Having facial numbness most likely indicates your tumor is touching your trigeminal nerve, which also runs through the internal auditory canal. Again, depending upon the skill and experience of your neurosurgeon and whether your tumor is wrapped around the facial nerve or not is what will be the biggest factors as to post-operative results. Many surgeons today leave part of the tumor if it is wrapped tightly around the facial nerve to preserve facial function. Then they can radiate the remaining small piece to stop any future growth.
3) I will have to admit, I am very skeptical about a doctor who says it will be a 10 day recovery following a craniotomy. It depends upon the definition of "recovery." After my first craniotomy 20 years ago, I was back to walking/functioning with no assistance in about a week, but it took 3 weeks or more to resume my normal routine. My first acoustic neuroma removal surgery (second craniotomy), it took me over two weeks before my eyes would totally focus and before I could walk without a walker ..... and it was a full six weeks or more before I was able to resume my normal routine. My second acoustic neuroma removal surgery (third craniotomy), I was able to walk without assistance in about 10 days and resumed my normal activities in about a month. I cannot stress this enough ..... it is vitally important to have the best surgeons possible for the best result.
As you say, everyone is different so it is impossible to predict one's recovery with 100% accuracy ahead of time. You do not say where you are located, nor if your physician has had much experience removing specifically acoustic neuromas.
Many thoughts and prayers.
Clarice
*Note: I edited this to correct the paragraph about facial numbness. (Thanks, Cheryl, for finding this!)