I've done solo trips at a value and a moderate. Being a woman alone I had a few reservations beforehand expecially staying in rooms that opened to the outside, but really it's very safe and even walking at night I still saw cast members and security, so I never felt in danger. Even at DTD which is more public there is always someone around watching. The bus areas are almost never abandoned so even if security is not right on the spot there are almost always people around, expecially families. It never seems spooky, but there usually a station around so if you ever do feel uncomfortable just go to them and I'm sure they will help.
I think you'll be fine. Just take ordinary precautions (lock your doors, both locks, be aware of your surroundings, don't be reckless or neglectful of your belongings, etc). It is very well lit and you'd have to really go out of your way to find a 'dark' path.