Amy didn't realize it, but when she let Caroline in, she guaranteed the other woman the ability to walk right into her home anytime she wished...even if they did not become roommates. It was part of being a vampire; Caroline could not enter a private dwelling unless being invited first. Regardless, Caroline would not have taken advantage anyway; she was not that kind of person and when Amy opened the door, she followed the other woman inside.
Amy was definitely friendly and Caroline allowed her to lead her through the house. It was pretty big with three bathrooms and two bathrooms. Caroline was already starting to consider the idea of moving in if Amy liked her that is. "Wow, it's pretty big. I like it though," she replied, offering the other blond a small smile.