Harmless until they, or the hotel if you want to look at it that way, drops us into a world with giant bugs that want to eat us. That happened before my arrival, and I am very grateful to have missed it. But that sort of thing happens quite often, among other less dangerous things.
Yes, Earth is our planet, and the Milky Way is our galaxy.
I'm happy to answer any other questions if I can.
I take it you're not from Earth or any dimension that has heard of Earth.