If I know a certain area I want to be in...Can I just call Disney and ask for it?
We will also be celebrating our anniversary there....Can I let them know that as well?
You can make a request for anything when it comes to the room. However, it is simply that, a request. You may or may not get it. You can also tell them about your anniversary. They may surprise you.
Do not ever expect them to acknowledge an event. If you want to make sure something is done, arrange it yourself through the Disney Florist or http://www.peggyssweetsandmore.com